I directly compared my son's 3W-100 to my DA-100, same for same cc displacement or at least advertised as such. As I mentioned it was a fair comparison done on the same day with like equipment and weighted models. The rest is just here-say, IMO.

You know not all of us are stuck on the ONE righteous brand with it's perceived value or status, this attitude is sorely recognized across our hobby with radios, servos, engines, airframes, props and much, much more. It is really unfortunate that so many are so narrow minded... Some modeler's abound with the attitude that what they have is it and that's all there is to it! I don't prescribe to such narrow minded renderings that focus on such arbitrary thoughts or delusions of grandeur.

Instead I put my wallet were my mouth is and try different combinations, engine and airframes. Any and all manufacturer's have had specific problems with their engines, believe me DA has been there too. There is a vast disparaging difference in units sold from one manufacture to another which contributes to the fairy-tales and then there is all those know it alls that just pass mis-information and wives tales on with absolutely no personal experience and or specific knowledge of said problems. Lets also not forget the number one factor associated with engine problems is the user themselves, again not the engine the USER and his lack of understanding of whats is or is not happening, improper setup, mal-adjusted carb's, fuel, heat and more.

I honestly believe that all of the engines mentioned thus far are exceptional products each with there own peculiar offerings, advantages and or dis-advantages.