I had a friend talk me into building one of these - first one took me about 6 hours (ok, it's a learning curve). Had to buy a new engine, but had pretty much everything else, between the friend and I. (2) tanks worth of bench running on the Magnum, and now about 4 flights. It's been a lot of fun to fly a plane I don't care about! Now, to get somebody in this area to fly against. With an empty CG at 3 3/4 inches, it seems very tail-heavy. When the tank is getting empty, I can't fly straight and level. I'm going to shift the battery forward, looking for 3 1/4 or so. I used (2) pieces of 4mm carbon tube as 'spar' - shoved one into the flutes near the CG, and another one near the back of the wing (after noticing some control reversal in a dive, on the first flight).
Yeah, not the greatest flying - but it'll turn nice and tight. Now, to get that Magnum broken in.