Me and my girlfriend wanted a quiet getaway, somewhere without screaming kids or ravers, somewhere we could get away from it all and just splash about in the sea, watch the sun go down with a cocktail etc and this hotel delivered brilliantly in that respect. We were just a bit let down on a couple of points and feel they're missing an opportunity to capitalise on such a brilliant location for those wanting a quiet retreat.

In short, I would stay there again, but here's some longer feedback broken down by category:

People
The people who go there are generally after the same thing (a quiet break) so it's a very relaxing atmosphere, mostly couples and no-one getting crazy drunk at night or anything. Mostly English and Spanish with some Northern European and French visitors.

Location
The location right on the little beach with the concrete jetty is lovely and quiet, great for swimming and snorkelling as well as just relaxing or watching the sun go down. There isn't much in the vicinity other than villas and other hotels, but you're a 5-minute walk up or down the coast away from slightly busier beaches (Cala Martina to the north, Cala Pada to the south where you catch the boat to Santa Eulalia). There's a Spar shop 5 minutes walk away for food, mags, toys etc and taxis into Santa Eulalia are €9. You can walk to the much less nice Es Cana in 10 minutes where there are lots of shops, restaurants and of course the Hippy Market every Wednesday which isn't as tacky as I thought it would be (I bought some nice stuff!).

Facilities
The main pool is great, usually quiet, with a second pool to the rear for lane swimming, next to which are table tennis tables which we loved. The grounds are well kept with sunbeds easy to grab any time (beach towels are available for a €10 deposit). The gym is OK with running, lifting etc machines.
The rooms are classic Spanish hotel rooms. Perfectly adequate and the free safe, fridge, aircon are all good.
The hotel is spotlessly clean and the maids do a great job.

Food
There is literally nothing good to say about the food. All your suspicions about mountains of bland, tasteless Spanish hotel buffet food will be well and truly confirmed here. On our first night we had no choice but to pay €17 to enter the dinner buffet, but could hardly eat any of it as it was all over-cooked, bland, greasy, rubbery etc. It was clear that other guests weren't too into it either. Whilst the a la carte menu at lunch was a bit better we quickly worked out that buying bread, salad, cheese etc from Spar was a much better bet for any food eaten at the hotel. Basically, assume there is no restaurant.

Staff
The front desk staff were a mixture of belligerent, non-English-speaking people who clearly weren't aware that their jobs lay in the service sector, along with a couple of efficient, English-speaking staff who weren't willing to go further than absolutely necessary. So overall we were pretty disappointed. I personally always make an effort to speak Spanish in Spain but when the things go wrong or you're doing serious transactional stuff, a hotel aimed at foreign tourists should have people with language skills so guests can resolve issues or at least know what's going on. Staff were basically deeply unhelpful.

Also, my girlfriend dropped her wallet in the lobby by the desk on our last day. Once we'd found someone who understood us no-one seemed at all bothered anyway, but thankfully it was returned the following day, only the €150 that was in it was missing. I guess that underlines how much the staff love their guests at Sol S'Argamassa.

Entertainment
I might be wrong about this, but do people who book in at a hotel in the middle of nowhere really want to have a load of really loud kids' entertainers shouting their way through 'Music Man' etc, running bingo sessions in 4 different languages and playing out amateurish versions of Pirates of the Mediterranean til 11pm? I think not, but like I say, this stuff generally drew some people.

Overall, the Melia group probably aren't even aware there's a problem at this hotel because it's always busy and as such it is allowed to rest on the quality of the location. The fact is, it could be a legendary hotel with an amazing reputation, much higher occupancy rates throughout the year and a bigger turnover if they made the most of the setting and the core of the hotel. With friendly staff, decent food and a fresh look at what activities and entertainment is provided I would go back here every year.

My first time in Ibiza, so nothing to compare to on the island.......

First impression exeeded expectations - secluded on small beach couple of pools lots of lounges
Rooms were larger than I expected - all rooms have twins - except singles which have a 3/4 bed - I would have prefered a double but that was only a small point
Went half board - food exceptional - variety, something for everyone - some reviews say it was repetitive, but just try something else - there must have been a dozen choices each night
Evening entertainment every night - was a real treat for such a comparitively small hotel
No porter - so had to take bag to room and bring it down on leaving - no problem for me - but for others may be
Gr8 bars/restaurants a short walk each way along the beach
Would recommend and will be returning

We have just returned from a 4 night break at this hotel.It is situated at the end of a bay, which is lovely. The hotel has a small beach, but this needed a bit of a clean up, and was quite scruffy.The pool area is very nicely spaced though, although i suspect at the height of the season it is rammed. the hotel public areas are very nice and cleaned reguarly and it shows, as was our double bedroom, which was basic, but clean with a safe and fridge that were free.Breakfasts were as you would expect with a good and plentiful buffet. All the staff we encountered were very friendly and helpful.
we had a car, so didnt walk into the local town which was Es Canar.We did visit though, but preferred the larger town of santa Eulalia, which had some lovely bars and restautants. Best beach we found was cala lleyna only a 5 minute drive.
The last thing i would say is that we were obviously there at the end of the season, so didnt see the madness that i am sure is there in July and august,

Four of us have just returned from an 11 day stay at the hotel which we thoroughly enjoyed. There were one or two minor points to moan about but the good points far outweighed them. We were very pleased with the quality/quantity and choice of the food. A wide selection was available. Admittedly some courses were repeated from meal to meal but there were also always sufficient new courses. It would however be difficult for a hotel not to repeat certain courses. We felt the choice would suit many nationalities. The only problem we found in the dining area was if you went for breakfast early cutlery etc hadn't been laid on every table.
Our rooms were directly above the entrance to reception and we were disturbed a number of times when buses arrived early morning.
We were pleasantly surprised to find that there is no charge to use the safe and fridge.
All the towels were changed daily and the sheets and pillow cases regularly.
All the staff were very pleasant, helpful and worked very hard.
The evening meals were from 7.30 to 10.00 which was probably the reason why the entertainment didn't start until around 9.45 pm. The acts were very varied, some of which mediocre but three were excellent. Two of them doing acrobats the other Flamenco dancing.
Drinks cost 2.5 euros for a glass of wine, 3.7 for a beer and 4 to 9.5 for a whiskey (depending on the brand ). The Spanish whiskey at 4 euros was fine. You also got a good measure.
Although the hotel is somewhat remote we found plenty to do to occupy us each day. Being remote helped to make it peaceful.To either side of the hotel there are plenty of bars along the beaches. A 15 minute stroll takes you to Cala Pada beach where you can catch a boat to either Santa Eulalia, a lovely medium sized town, for 5/10 euros single/return. Or Ibiza town for 16 euros return. A taxi from Santa Eulalia to the hotel never cost more than 7.5 euros. In the oposite direction one can walk to Es Cana another lovely seaside resort. A large Hippy Market is held there every Wednesday but beware as we found some prices more than double in the shops, and you are jostled along. It wasn't our "cup of tea".
We went on a couple of 3 hour Thomas the Tank Engine rides at 15 euros each, and the only problem with them is that you get 4 stops and you don't get long at each. But they were interesting.
We tended to stay around the hotel from mid/late afternoon onwards and never had a problem getting sun loungers. There are plenty to go round and the grounds are large. There are two swimming pools with lifeguards at each, who must get rather bored, as most people went in the sea. There is also a small gym in the grounds, free of charge. Please note there are toilets and showers near the gym, useful if you build up a sweat or go swimming. We didn't realise they were there until late on.
We don't usually go back to any hotels but would have no qualms staying at the Sol S'Argamassa again.