I just purchased the Nikon 17-55mm after putting it off for a long time. I was reluctant to pay that much for an old DX lens and was so satisfied with the Nikon 16-85mm. However, as my photography has moved into doing more photo shoot and event work, there was a need for a lens with fast focusing and a larger aperture. Needless to say, after all the push back, I'm very happy I finally made this purchase. This lens is a gem...fast to focus, tack sharp, and great color rendering. I'm thinking about selling my 16-85 and 50 f/1.4 now that I have this. Initially, I was planning to use this new 17-55 only for my paid work and keep these other lenses as a travel pair, but wanted to get some take from people who use the 17-55 when traveling. If anyone can share their general experiences with this lens while traveling to different places, I'd really appreciate your stories/advice/input. By the way, I'm using a D90 body.