Should I or shouldn't I? I have the chance to grab one of these lenses in mint shape for $150. I already own the Nikon non-D version of this lens and routinely see the D version selling on the auction site for two to three times as much as the non-D. It often fetches $250 to $300 or so. Is there a big difference in the two lenses? Quality? Autofocus speed? I use the non-D on my N8008s and other cameras that don't take advantage of the D function. However, my N70 and N90s can use the D function, along with the SB-26 and SB-28 strobes. Given that the D capabilities and claims by Nikon may be just so much bushwah, and setting that aside for now, is the D lens actually any better or more desireable? It seems to have picked up some cult status along the way. This is not meant to stir debate about the alleged value of the D function, rather just the merits of this particular lens. Any thoughts by anyone who uses the 70-210 f4-5.6D lens or both versions?