I went with my wife, two daughters (8 and 11), sister-in-law, niece (17), and two nephews (10 and 15). All had a blast. The boats were big enough to have all of us aboard one.
The outfit was very organized and professional and seemed a cut well above the other companies running tours on the river at the same time. They were running 10 zodiacs at a time in their flotilla, plus 1 extra boat to as a safety spotter and to pick up any passengers who chickened out (none did).
We went for the half day package and that was fine for us. Not sure there would be much to be gained by doing the full day.
My only criticism is that the shower and change rooms are a bit small/limited given the number of customers they can run at once. If you are staying nearby you will probably want to just head there and change.
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