Several of the boats i'm looking to buy have mercury engines on them, i'm not a big fan of mercury's from the older models, but haven't owned one in years, are they now a good engine? How do they compare to yamahas and etechs? They are all 2-strokes most in the 150-200hp optimax series and 2002 or newer, hours are from 200-400 hundred hours. The boats are all 18-20ft cc's i'm looking at. What are your opinions on them?