John Deere 764 high speed dozer

I just saw this on you tube ,this awesome looking new type of dozer,I know they been around for a while know,but they are new to me and look like it would be blast to operate one of these dozers,I doint know how good they are at heavy cutting but they look like they are really fast at spreading material to grade,I was just wondering if anyone out there in dozer land had actually ran one of these John Deere 764 high speed dozers and are they as smooth as they look,thanks foozzer