We got a little time to play with Sigma's new 180mm macro at their booth yesterday and initial impressions are definitely positive. The HSM motor is extremely smooth, quiet, and snappy. The lens itself is fairly hefty as you'd expect of a 180mm, but the optical stabilization seemed to do a good job fighting camera shake. We'll have a much better idea of how good it is after it goes through our lab. The 1:1 reproduction on a lens this long is nice, too. Combined with the quiet focusing, it should make for some great insect photos in the future.