I have a Tower 46 I bought for $10 bucks, and it has turned out to be one of the best engines I have had. Maybe I just got lucky. It has never quit on me yet, after probably 50 flights. I turn an APC 10x6 prop and it will hover a Twist 40 at 2/3 throttle. I also have a box of OS 40 & 46 LA engines. They are all good for their purpose. "TRAINERS", but if you want power, stay away from them. The best bang for the buck though is the TT pro 46.