I've owned TT's, os,magnums, HB's, HP's, enya's and super tigres, the super tigre has to be one of the best running and longest lasting engines I've ever owned. The TT seems to put out more power but tends to be more finicky in setup. The HB & HP engines are more of a collectors or preference engine. Enya's aren't real power hoouses but reliable, magnums tend to be lower on power than TT's but seem to be easy to tune and run. I prefer Super tigre, over all others.