They are brilliant! I bought 2, 1 each for my Son and me about 3 months ago, and we race/jump them in the living room. We can't do that with our 1/10 scale drifters! Threaded axles, ball raced, Lipo and BB2 Atomic motor; BRILLIANT. We had our first breakage a couple of days ago, due to playing outside in cold weather, the plastic obviously got too brittle. I'm surprised it took this long to break anything, they have taken a lot of abuse/ fun etc.I've just replaced the borken parts with alloy ones and am trying to resist the urge to completely upgrade them. The only REAL weakness is the diff. If someone produced an upgraded one, I'd buy 2!