If you don't own a pair of these yet, you are pretty much blowing it.  This lens is completely insane.  Talk about technology, a lens that really changes from 65% to Black Iridium, come on now!  My personal favorite is the Crosshair, but you guys can pick your own.  Go to your local OPD and buy a pair, don't buy them off the web!  If I find you you did, I'm going to be pretty bummed out at you.  Support your local dealer!