Prior to ordering this engine I spent a lot of time on RCU researching. Seems that out of every ten, 3 hate this engine, and seven loved it. So I figured what the heck, for 99.00 I will risk it. Mounted it on a test stand today, filler her up with 10%, two turns with a chicken stick, and off she went-- like to pull the wooden horse it was mounted to across the room. Ran a tank per their instructions. Idled great, great transition, SCREAming power with a 12X6, no problem quitting. If it is this good in a plane, why oh why did I ever wait? What a buy!