There were good bits on the campy and Suntour.
The XC Pro thumbies have such a light action. For me though, after XT, felt too light. The front mechs really were the nuts too.
Though all in, I have to say M900 was the nuts. It was a good step up from XT, and looked better than any gruppo since. The finish, function, and quality on all parts was superb.
If only the new stuff looked as good. 952 mechs look cheap and nasty
Will wait till I see the new X brand stuff, but pics - they don't impress me much.