Hi, I have been using ACDSee for Windows for years. I recently switched to Mac and Lightroom, and in general I have been very impressed with Lightroom, but the feature that I use the most in ACDSee doesn't work well in Lightroom. I really wish the "compare" feature worked more like ACDSee. You can view several photos at a time with simultaneous zooming. You can tag, rate and do other things in the compare view as well. Either I am missing something, or Lightroom only lets you compare 2 images at a time and doesn't work nearly as well as acdsee. When I have hundreds of images to sort through, ACDSee is still the fastest way to do it. Adobe, please improve the compare feature! Thanks!