I rode a 6000 for about a year. I traded it for a 7000 for the better gear. The XT on the 7000 seemed to shift more quickly and is "snappier", if that is a good term. Since then I tried a Fuel 90. Big mistake. Heavy and a lot of work to ride. Only took half a season before going back to a hardtail with all XT running gear and Avid mechanical brakes. Is really an ideal ride (for me). Should have kept the 7000, as that is essentially what I am back to, other than my new MTB is steel, which provides a nicer ride. The biggest improvements I can suggest are the XT running gear, Avid disk brakes and the SID fork. At 200 pounds, I found the SID SL to be the biggest single improvement. The Avid brakes are second (or first when it is wet out). But the 6000 was a nice ride and you can't go wrong up-grading the components on it.