How big of a roost does that twin throw?
My friend's naturally aspirated jet has been clocked at 118 mph.
And to answer your subject title of "are these boats any good?", dollar for dollar, no they aren't any good. They don't throw a roost, they can't run in shallow (less than a foot) river water, they cost a mininum of $3,000 every time they go to the shop, they cost a fortune to buy, and they're difficult to work on. Other than those ugly things hanging off of the back, they're good looking boats.