E-Tec’s are supposed to be great engines. If he had compression checks, ask to see the printed results (which it looks like you already did).
If you are serious about the boat, have him take you for a ride in it, if you still like it, negotiate a price and give a deposit pending a boat survey. Then get it surveyed by a professional accredited boat surveyor. If any problems come up, you can decide to back out or if small issue you can negotiate price from there.
Listed below is a link to find an accredited boat surveyor in your area. Should be about $500 for that size boat but the best insurance you can buy and you get like a 30 page document about the boat. Outboard check is typically separate and is about $100.
Membership Roster for Texas