If durability is your first priority no doubt xray is the most durable buggy on the market but that doesn't mean you'll be fastest with it or other buggies are not durable enough. My first priority has allways been the drive characteristic and because of that I try some friends vehicles before buy a new kit. I don't care about durability too much because IMO all top brand buggies are durable enough (maybe only with some minor weak points)