I installed Lion today and at that point I realized I was running out of space on my HD. I have a 600GB hard drive. Somehow multiple icon images from some program invaded all user profiles on the machine, and (annoyingly) showed up in iPhoto. Literally at least 10,000 duplicates. I went and looked for software and this one came up, but had no reviews. I want to allay Anyones fear about this product. Not only did it do the job, but I made it switch between user profiles at the same time and it still did the job. Of course, the software has no way of knowing which version you want, if at all, so there is user intervention. But as far as usability, permissions and such, this was a total champ. Thank you Araxis for producing an excellent product.