I flew my UCanDo last weekend with the SurpassII non pumped and it was pretty good. It'll hover at about 1/2 throttle on a 15*4W, and slowly but surely climb out. The engine is brand new, so it may break in more, it actually picked up 150 rpms from Saturday to Sunday. Even if it doesn't though, I was more then pleased with it. The plane flies awesome, it's so stable and can fly soooo slowww. I had my CG at 5-5.25 inches and it wouldn't waterfall with just down elevator, but with up flap also it would do a very stable waterfall, and it didn't try and bail out the side as much as a Scale Aerobatic plane. I've moved the CG to 6" for this weekend's festivities so I'll report on the performance then. I just want it to flatten out in Flat Spins more, and tighten up in a knife edge spin. It required a little more down elevator then I like inverted at 5" too.