About quality and finish, Xray seems to be getting all the cred. And yeah, they're good at it. But I've built around 60 R/C cars, incl. Xray, and I must say that Yokomo is at the top of my fit and finish list. Kyosho, Tamiya and Xray fight over the next spot, but it depends a bit on which kit you choose
But about offroad, when Xray also joins the game, that is really something