A buddy of mine just took delivery of this Bombard... I believe it's 5.4m or so, powered with a 75 4-stroke.
The boat is rated for a 90, and if it was mine, I think I'd have gone full pop.
This day was fairly choppy with about 2-3' waves. Compared to my Hurricane, it didn't do too well, but was certainly respectable. I literally traveled at twice his speed... but my boat is probably at least twice the weight, and twice the horsies... but three times the price! (At today's replacement cost, my boat, motor and rigging sell for about $75K here... he paid $27K, all in, including the trailer...)
He's pretty happy with it, and for a sport boat, it looks pretty good, but I don't know it would stand up to really heavy use, long term...