Vatechguy3, good luck with the DA, it is a sweet motor, plus you can get them easily. I can't say anything bad about them.

For general Discussion:
I don't think the BME makes huge power over the DA, but after reading different posts, it does seem to make consistently 300-500 more RPM than the DA. Of course the BME is 10cc's larger and this I assume is the largest contributer to those numbers. I am not sure of how much of a difference that would make in the air. For my example, the airframe I have is smaller than the 35% planes that are out there and had I used the DA it would have added 2 more lbs to the nose and an additional 1/2 lb to the tale to counterbalance this. This brings the flying weight up to 26lbs instead of 23.5lbs. I spent much time cussing and swearing that pre made headers where not available, but at the end of the day I could not bring myself to add 2.5 lbs to the airplane just to save a couple of afternoons of work. If you have a 35% aircraft that is designed for the the nose weight such as the Carden, then the BME really doesn't gain you much. Although, I am convinced that through careful building and moving battery packs and other radio gear forward, most 35% aircraft can be built lighter with a BME. Verticle performance is a function of a few things, the thrust vs. the weight of the plane and the drag of the airframe. The drag is hard to change since most IMAC planes are designed to have large amounts of drag, but the weight issue can and does make a difference.