i don't speak with emotion or for what i have, had nothing but problems with sea-doo,s and ski doos couldn't seem to keep cranks in them esp( rev 800 power teks and 700 triples) merc may not be the absoulte best on the water but i havn't had any problems with the ones i have owned, fuel mileage is close among modern engines thats almost a non argument, but if i was going to but a new engine right now it would be a yamaha eithe 4 stroke or 2 stroke, have a hard time thinking a e-tec would even compare to a v-max engine.