If I was to do a comparison, I would be comparing it to a 3W-55 but have better ignition with the 3MM. As for quality, if it's even close to a 3W you should be able to put many hundreds of hours on it and do nothing to it. I know I do. Finding the cheapest engine is easy. Finding quality and power is another. Just looking at the case quality of this 3MM puts it well ahead of most of the other clones I've seen to date, and a few of the higher priced engines available.