Obviously I'm doing a D575 but I have some problems. It has 8 mobile pair of boogies, chain tensioner, suspension, ripper with 8 pneumatics, 2 air pumps, the blade can be raised and you can adjust the angle thanks to the upper independent pneumatics and beside all this is a narrow machine... but all this pay a heavy price... the aesthetics. Maximum functionality and aesthetics are opposites?, I think on this scale yes they are... How to know when it's good not to copy a function in exchange for more site... I think it is pretty good until now but I still have a hard job and fun in the blade because of its adjustable angle .