We have an O'Brien Super Screamer- fun to throw them off, but usually we have either young kids and adults, so we don't even use it anymore. Build quality is great.
HO Drifter - 2 person round,flat, but with a back. By far the favorite, holds up great, you can really whip them and they can hold on really well
Connelly Fun 3 - 3 person, kind of the same as the Drifter, but for 3 people. It good, it is reversible, which we've never tried yet. One disappointing thing is they have a Boston Valve in the bottom and a crappy "old school type" filler in the top. This drives me nuts. But I've had 500lbs of guys on it with a crazy whip going and she held up, so must be built good!