The obvious to me would be how many hours the engine has on it. Where was it kept (outside or in a garage), is is got a fuel water serator (poss not).
However, the boat is one of the best boats around (hull wise). Check the tuvbes and valves. Open the valves and see if they leak air. Look at the seams and the hull. see if it has any bumps.
Price is reasonable (to good) fo the boat age, engine provided kept well and is tidy.
That's all I can say.
If it was me I would have gone for it. But I'm Greek LOLOL
Ups forgot: Check the engine trim that works properly and that the bat is OK and how may amps - I think they call that way (should be 100).