I have the Magic Extra with an OS .50 SX. My fuse did break in half in the middle were it is weak, my engine was still new and I leaned it out just a little to much and just as I took off it shut down on me. It came down a little to hard. I apoxyed it back together and it has been fine since then. There are some people at my club that are using the Magnum .52 that like it very much. I haven't heard any complaints about the engine so far. The Magic Extra is a fine flying plane and will land like a trainer. It's true, It does have some trouble flying 3D. Mine has some coupling in Knife edge and I can't seen to get the balance just rignt to hover very good. If you had a good computer radio you could program some of these bad tendencies out but I don't. Still it's a nice flying plane.