I know I'll be losing a couple of stops, and I don't need the extra reach thaaaaaat much. VRII is apparently pretty spiffy, a mode for handheld shots as well as out of a moving vehicle (which I do a lot). Another big thing for me is build quality- As some of you Tammy owners know, it isn't on par with Nikon glass. A little wider, and that's good in my books. Any input guys? Oh yeah, my buddy is going to be picking up my Tamron for 350, so I'd only be losing 50 bucks. I've had it for a little over a month.