The XB chassis & suspension are the best I have ridden. The mill is fine for street duty, but it's not going to blow anyone away on the track. People that like to scan spec sheets, prolly won't buy one. If you spend any time on one (with the suspension setup correctly) there is alot to like. It's kinda like putting a big block Chevy in a Porsche 911 GT3--not for everyone, but I like mine. Speaking of motors...the 919 has the best street motor I have ridden. Plenty of torque and a very linear power delivery. Little shifting required, it'll pull hard in 6th gear from 2,500 to the redline.