I have a 52 Magnum 4 stroke that runs like a top, and I have never had a single dead stick with it. The one I have is very dependable with a super idle, and a great Transition. 10350RPM with a 12X5 APC, and super cool to the touch after a good long run. I run 15% Cool Power fuel in it, and the fuel consumption is very low. Easy 15 minute Flights with a 12oz tank. I gave $149 for mine early last year, but I think I seen them on sale rescently at Hobby People for around $120. My larger 4 strokes are Saitos, but I have no complaints with the smaller 4 stroke magnum. It has alot mellower sound than the Saito, but the 52 Magnum still generates a good amount of Power for its size. I run mine in a Great Planes extra 300s .40 which will handle a much bigger Power Plant than what I have in it, up to a .91 4stroke, but the 52 Mag 4stroke would be sweet on a Sig 4star .40.