Joe,
Let's get this straight, you talked to Brain Huffmeijer at DA and he said there are hundreds doing it? Hmmmm, I'll give him a call and drop your name.
It is kind of weird that DA has many many highend customers that have won TOCs and contests of various kinds and that brand of customer is very very happy with their product but there are entry level type 50cc pilots bashing them on the internet.
I'm really really glad DA makes this 50 engine. THere are other 50s for sale too. I'm really glad there are others out there making and competing in this size market too. They all bring their best to our hobby and that is good for everyone. It makes for many choices and this might be one. If anyone want to sell me a DA 50 that is having trouble really cheap, just let me know!~)
Deputydog, that is very much what happened to me too. I leaned the low end some and ran more fuel through it. Bottom line for me is DA will get more of my money and I thank them for being in business and for making an engine in a class that I can use right now. Glad your engine is running great. I never had the engine quit on me in the air either!~)

This engine has given me a very positive experience!

Fly model planes!~)

Joe