I have a 650 standard model and my wife has the 400. I just did her oil and filter and check up/ test drive. While I was riding her 400 I was thinking, I would really like to have the simple cvt drive unit on my 650. I never use the standard option or the power button. I just twist and go. It would eliminate a lot of extra machinery that could go wrong. I wouldn.t even mind changing a belt every 15 or 20k. I quess I just like things uncomplicated. I have only had my 650 for a short time and am not completely trusting of it yet. Anyway Just a thought.