I am flying mine with an OS61fx, quad flaps, and have it programmed for crow. I like the plane so much that it is my 3rd one. I would recommend doing a search on RCU and reading threads about some of the modifications. I added a sullivan tailwheel to mine, and reinforced the wing dowels, and the rear wing mounting plate. For the wing dowels, I bought solid oak doweling and replaced the ones that came with the ARF. I also added a fuel dot for easy fueling access, and reinforced the landing gear block. Now that I think about it, I do this with pretty much every ARF I assemble. I like this design so much, I also have the Ultra Stick Lite in my fleet.