we've had 3 , yes they do break like all floats but can take a hell of abuse, very stable- two adult can float in one - no problem. We take our in the waves and the kids love it, won't tip and the wave just sweeps it on the beach. I do abuse the heck out of ours while playing with the kids... and they do hold together pretty well. A MUST have if you have jids and a pool!
This item looked amazing, however when i inflated and tried using it, it was very disappointing because it couldn't handle my weight. This item is only good for young kids up to 25lbs. It requires a HUGE pool and can be very dangerous because it can tip very easily and you can get injured by getting hit from the side of the pool. I think the better application for this item would be the ocean.
After 5 days the seams split and the sides pulled away from each other.