The only problem I have with the 100 2,8L IS macro is it didn't come with the tripod collar. When I got this lens, it was for a lot of 1/200, f/14, iso 100 1:1 close up macro work. However, now I've stepped back a bit and started trying to get backgrounds in my macro shots. The IS helps tremendously for that. I love everything about this lens. I had reservations about getting since I already owned the non IS version, but I am glad I went with it. One thing to mention is I can AF at close to 1:1 where you can't do that with the non IS. I'd prefer to be manual and rock back and forth but sometimes with some small insects, the AF just works better.