Hi, I had a Goldberg Extra 300 for a time.. I used a Ryobi gas engine for a while and then I changed for a Supertigre G-2300 ring. It flown like a jet. It was wonderfull see it doing snaps rolls, lomceaks and a lot of cools maneuvers, but I have to tell you to be carefull with flat spins. This plane perform beautiful spins and flat spins but you must be ready to get the plane out of that maneuvre. In my case I did a flat spin, and it didn't recovered, hitting the ground in a flat rotation. These are pictures of before and after the accident.