built mine last year and am still flying it. I used an OS 91FS, with the rudder servo all the way in the back. I fly off a grass field, had to ditch the wheel pants and go to larger wheels. I also had to shim the gear forward to avoid noseover. I ended up moving the battery further back than the plans show to get the CG right. The long servo lead for the rudder servo initially produced RF. Had to re-wire and now its OK. I found this plane initially hard to set up and trim. I found the suggested low rates for elevator and aileron to be too conservative for my taste, but thought the high rates were uncomfortably aggressive. You'll just have to experiment for yourself----I absolutely think you should start off with the suggested throws and go from there. Elevator authority is BIG---seemingly small elevator movements translate into big changes in attitude. After about a dozen flights I got this plane dialed in and I really enjoy it. Feels like a much larger plane in the air. Rolls, spins, knife edges are all terrific. Landings take some practice---landing speeds are much quicker than an Extra or Laser. I think the engineering of this kit is absolutely superb---best parts fit I've ever seen. I'd build another one in a flash.