How did you hear about them?
Advertising, recommendation or other?
Never used the split cab fare service, but if it's cheaper then full fare, why not.
Id always recommend underground first, but if you struggle carrying luggage them it may not be for you.
Have you considered pre booking a minicab.
'Arriving 3/3 at 7:30am going to Kensington area. The Underground is too difficult with 2 suit cases.' Unless you plan to travel with two checked bags (that is, presuming one of your bags will be a rollaboard) then split the difference and take the Underground and a black cab.
It's a step free trip from Heathrow to Earl's Court station. Take the lift up from Piccadilly line platform to the Earl's Court Road ticket hall and way out. Leave the station and step away from the busy entrance area, wait a minute for a black cab to come by, hail it and take it to your unknown Kensington area destination. Travel time is about 25 minutes from Heathrow to Earl's Court.
struggling with luggage is too difficult on Underground. Is a Minicab cheaper than the regular taxi? I looked up several companies suggested on this site and they all seem to be running around $55 to $75.
"struggling with luggage is too difficult on Underground"
Where is the pick up point for the cab and how have you evaluated that it will be easier to get to than the step free underground station?
Cut down on the luggage, it is never good to travel with more stuff than you can manage. It makes everything more difficult.