The wife and I have a 20' Predator/175 sport jet.It has been problem free,although harder to start than I think it should be.Extremely dependable,easy to maintain and has not failed us once.
We usually only have 2-3 people in it but my wife packs enough stuff to make up for an extra.We can get 42-45 mph out of it and on plne real quik so I dont see where power would be an issue.
A little noisy but really not bad.Especially when you hear some of the other boats out there.
I think they are like anything else.Your going to hear plenty of good and bad.Just depends on who you talk to.
The main thing is buy from a dealer thats going to back what they sell.There has been plenty on that topic on this board.