I didn't realize we had so many other (now or former) go-fasts on here!
My old man figured we might as well learn how on small boats with big engines the way he did... the current 'yacht' is a 20' kevlar Allison he left to myself and my brothers with a worked Merc 2.4 Bridgeport Offshore. Can't be slow in a following sea or sit at idle for too long as it tends to, umm, take on a bit of water over the transom.
I stuffed that at about 50 a few years ago in 2' lake waves and still have occasional neck twinges. Since then, I won't take it out in anything over about a 6"-8" chop. God forbid running 115-118 and taking a bad wave.