Older XTR M952 vs new SLX 662
Tried to find this on other discussions, but can't find it, so here goes....
I just bought a used bike (approx 7 yrs) that came originally with an XTR M952. However, the spring is shot so it won't stay in gear. They sent me a new SLX 662 to replace it.
My question is whether the it is worth the $22 spring to fix the XTR, or to go with the newer SLX Most LBS guys I talk to say that newer derailleurs at a "lower" level are actually superior to older models at a "higher" level. So is it possible that the new SLX is actually a better derailleur than the almost-vintage M952?
Finally, as a weekend warrior, would I really notice a difference one way or the other? Thanks.