I'd say this lens is definitely worth its price, but that's probably not giving it enough credit, given its price. I'd be very happy with it if I'd paid $300, but at half that, it's a no-brainer. I haven't missed IS yet, either, although part of that is that for most of what I've used it for, there's enough subject motion that it wouldn't help at slower than 1/50. I've just been getting more comfortable letting my ISO creep up to 3200 if I need it at 1/50 and f/2.8. Plus, combine that with the super small size and light weight, and this lens has pretty much lived on my 7D since I got it. It even came on a horseback ride this morning, and was great.