Have i done the right thing?

loxster71 Posts: 269
edited January 2010 in MTB beginners
Just bought a shimano xt m771 ( i believe) rear mech from wiggle for £26, it's the OE version which i believe doesn't come in original box with instructions.
Is this a good deal or are these different in some way to a proper boxed version??

Thanks loxster.
Giant Trance X3
Boardman Limited Edition Carbon #344
BMC Streetfire ssx( converted to flat bar Hybrid)