Flown at leat half a dozen. Mine came out a 4 3/4 lbs with a Webra 50 on it (kit). Another guy in the club built one and it came out at 6 1/2 lbs witha 46 FX in it. Used a lot of epoxy & reinforced some things he didn't need to. Those were the two extremes. The other kits/ARF's I've flown have been inbetween, but generally my experience has been the kits come out weighing less. The best benefit of a kit probably isn;t weight, but the ability to add to the rudder & put a pull/pull system in for elevator & rudder.