I have been flying my Ultimate for about a month now. OS 52 FS for power. The OS is the only thing that has given me trouble; the airplane is great. This is my very first ARF and it probably won't be my last. The only thing I changed on the plane was to convert the wire landing gear to a stamped aluminum Great Planes unit and I left off the wheel pants ( I fly off of grass). The airplane rolls well, though not perfectly axial, loops great, Knife edges like no other aircraft I have ever flown. Hardly needs top rudder at all. I wish they had used different color schemes on the top and bottem; I had to add some large stripes on the bottem to help me keep orientation.