The Force D2 derailleur performs pretty much the same as the D1 version but now has a fluid dampener but more importantly it actually looks good w/ it's black and metallic finish. The old grey Force simply looked cheap. The big reason to upgrade or choose the D2 over the D1 version is now you can now use up to a 36T cassette so if you just want massive range or even do 1X you now can.
