I agree 100% Downt,, It does havce a sluggish start to the rev up, I just thought it was because I haven't tuned in my low idle yet, plus like I said, its a pattern ship I just floor it an go basically, I'll have to do some further tests, and Yes It absolutly needs immediate response for 3D and low low earth sweeping hovers, I was told to use a Perry Carb on the thing and that would solve most problems, but I haven't done that yet, I believe it should fly fine out o=f the box or its not worth anything, I will only By OS from here on out, I thought I'd save a few bucks this time and try a new product,, [&o] I wasn't really happy,,, [:-][&o] But the motor is working okay now, it just took some doing,,, I still would have rather had the OS 1.60 instead. I like the sounds of the DA50 though