I really wanted this lens, but instead I bought the 300/4 IS and the 70-200/4 non-IS for somewhat less money. I am happy with the decision, since 200 wasn't long enough for birds and the like. The non-IS 70-200 is stupendously sharp, light, and can be found readily on the Craigslist, "I just upgraded and am desperate for cash" market. It is my favorite hiking lens.