I have one on a Hangar 9 Twist 60 and I have about wo gallons of gas through it...I can tell you I will not be buying the more expensive again...That engine runs just as good as my OS 75..I have never dead sticked it...But you will have to run about a half gallon of gas through it to get it broke in...They are very tight engine so don't be surprised when you get it if it is very hard to turn over...I fly my twist 60 at about 1/2 or less throttle and that Tower 75 will pull that plane unlimited vert at 1/2 throttle with 14x4W prop....Just my 2 cents...