Info Merc Opti 150

[willy]

Listen fellers I need some advise, today I went to look at that 1996 V21 I posted a few days ago. It is actually very nice, rock solid hull, floors and the transom seems very solid. Moisture meter read slightly moist in the area near the top aluminum cap strip but dry everywhere else. I talked the guy down and then hit him with the trailer gambit, the single axle on it is a six lug but was rough, needed time and money put into it to make it work.
Right next to this boat he had a Century with a 2007 galvanized dual axle (torsion) with brakes, I offered him 10,200 for the V on the new trailer. In the end he came back over the phone after I left with 11G's for both.

Heres the glitch in my mind and why I need some advise.
The original motor on the boat had a blown power head, rather than repair the older motor they bought a 2003 Opti 150 that has been rebuilt by C&C Marine, a good rep shop in south jersey for Merc, and put that on, it reportedly has less than 50 hrs on it and looks pretty nice.

Other than getting a full survey on it which I have arranged to do next week what is the opinion on these engines from you guys who know them from experience or other knowledge?
As you guys know I have had two of them used, older Black Max's and they crushed me with bullcrap problems so I am not a big fan.
I need some feedback from the brothers before I step into the hole