I have a D6RXL with System One and I cannot tell a difference while running it. I bought it new about a year ago and it has around 1200hrs on it. No problems yet - it has cleared, stripped topsoil and ripped rock. (well as much rock as a D6
can rip) It has run on some steep slopes and some rough material. I need to get the Cat house to measure the undercarriage wear to see exactly where we are at.
Now I will have to say I only have 50 or so hours operating it - I am too busy trying to figure out how to
pay for it, so I don't get much stick time anymore.
This picture was taken last winter.