you are a XC rider I assume?
Well here is what I heard from another rider who owns a XTR (not 07) compare to Avid Juicy's :
1. Brake Pad problem
2. Doesnt modulate as good as Avid
3. Avid is a better choice.
Im always a fan of Avid brakes
, I dont know anything bout the new Avid Ultimate or XTR 07 but Im very sure the Ultimate will retain or maybe improve all the good stuffs that Avid Juicy are known for, not sure bout the XTR though, sorry.