I love it. It is very roomy. I moved up from a 25 foot boat. It actually took me a bit longer to get used to docking a twin engine boat than I thought it would. Everyone seems to think that twins will automatically be easier. I think I just had a tough time switching my mind set from a single to twins. I have had boats for almost 18 years, all singles before I got this one.
I know a guy who has the same boat and he tubes with it. It is a bit big for my taste for that but if you have a space with enough open water and no other boats to worry about, because you will need a bit more space than a 21 footer to turn around and pick up a dropped tuber, then it should do fine for that. Will make monster wakes, thats for sure, so, good for tubes not so good for skiers.
As far as people on your boat, I haven't really loaded it up, I didn't get it till last july. But I think if every one sits down and you are going for a cruise you probably have room for ten, however if you are spending the day out and want to tube and everyone will be up and about all day probably 6-7 would be more comfortable. It is a wide boat so it makes for more space in the cockpit but you do have to remember the cabin takes up alot of length and is probably not someplace you will spend alot of time as far as entertaining guests. It will be for people to take a break out of the sun or use the head or make a quick sandwich etc.
If you plan on loading it up like that, that is another reason for big blocks.
I do love this boat though. It is fun and extremely comfortable to drive and just hang out on, and it attracts alot of attention out on the water. What color are you getting?