Well I built mine several months ago and only just ran it about 30 minutes ago. Only with A 13t motor but it was smoooooth and smoooth (really smooth) and pretty fast, I could drive it flat out almost everywhere on a track made from very fine and thick dust, even got some sideways traction rolls on a track like that, amazing. I had high hopes for the car but it's better than I expected. I also expected to break a diff straight up but had no problems at all on the first run, so far so good
but it's not a very powerful motor so we will see what happens when I get something faster in it. I got this one for a crazy good price and normally I wouldn't have bought a 4wd but if I was going to buy another one other than this it would have been the latest Lazer