They are whisper quiet at idle, but wot 2strokes and 4 strokes are both loud. The only negatives I've heard on Yamaha's is you HAVE to keep up with their maintenance schedule, and be sure to let the motor warm up before dropping the hammer. A friend of mine went to an outboard class, the teaching mechanic said said the EPO boats went from Yammi to ETEC because of the cold start problem.
If your rude was was a 2stroke, you'll see a big difference on coming to plane, but after that, you'll just save money at the same speed.
Good Luck
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