I had a chance to ride a 10HCR and a 09 M8 yesterday and found there handling very similar to my 09 D800.Yes the cat engine makes a little more power but it was noticably a shacking vibrator just like the 10 summit everst I tried last wednesday.The Polaris motors may be down a couple of ponies but they are WAY smoother.The Vibration on those cat motors would drive me nuts as I could feel it right thru the bars