Put this on the For What It's Worth file, I've got OS's, Saitos, SuperTigres, gassers and Magnum engines. I've seen any of the above run great and I've seen them not even able to get off the ground. ANY manufacturer can have a bad engine but there's so much to tuning that makes an engine good or bad that it's almost personal as to whether an engine will be good or bad. I would say to take a look around as to what everyone at your field is flying and THAT would be the best spent money. They know how to tune them, repair them and maintain them. Your knowledge base is already expanded by their knowledge and support. IF you are the type of person that likes to take the road less traveled, you can step out but remember, you're on your own so listen to everyone but make up your own mind based on what YOU think/know is correct. I figured out early on that EVERYONE has an opinion and they're willing to share it, just remember, they don't have to live with the results of what they suggest.