The 655 as a hull is pretty good, and the hulls themselves generally well laid up and sound. The Yam 150 is better than the original dog slow Honda 130, but still slightly underpowered for that size hull given it's a constant deep V.
Originally they had 3 tanks I think, not clear whether all have been ripped out and replaced or just one? Was the deck pulled up and relaid when the tank was done? Because of the significant order volume Ribtec had to cut several corners to get all these boats produced on time (which also essentially killed the business as this took all of their production capacity for quite a while), and the original deck probably wasn't sealed underneath and possibly the top of the transom. I'd be most concerned about fuel tanks, deck, transom and electrics, but if all have been checked/replaced it could be a sound boat.
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