Buying any used boat has potential problems.
First, you always want to take it out for a test ride. That is the essayist way for some one to tell if there are issues.
If it's a supercharged boat... the superchargers need rebuilt every 100 hr. Find out how much time is on the boat, and if they have been done. They guy may be selling it because they need done. (Expensive)
Other than that... they are good boats.