I fly the Magnum XLS .52A, which is made by the same manufacturer who makes Evolution engines for Horizon. It's a nice reliable 2-stroke with plenty of power, but it's not any more powerful than my O.S. .46 or GMS .47 engines. I bought the XLS .52A on a whim when one of the local hobby stores was dumping them for $55. As much as I like mine, I doubt I'd pay the normal $95 price tag for another one.