What are the gotcha's with this type of boat?

Thinking about buying this '96 bombardier jetboat, twin rotax engines,
guy wants $6450, boat LOOKS nice.

Given there no traditional transom issues (I suppose!) what do I need
to watch out for with this kind of boat? Compression test? Basically;

- what do I need to watch out for?
- what should I be asking the mechanic to check?
- what should I offer?