I've used it with a few of my clients and it's quite good, and the best part is that it's a freebee. It usually doubles the space recovered (sometimes more) than what you would get when you just clear out your internet temp files. You can also tell it to look at other programs, for instance if you use Firefox, or Netscape or any other web browser that it knows about. It also allows you to chose certain files, (cookies for instance) that you want to keep, such as cookies that have site login information (the remember me option on our site for instance). I quite like it, but it can remove some items that you might want to keep, so before you use it, make sure you understand what it's deleting. The only real problems that I have seen is when it deletes auto-logon entries, some people have complained about that, but even that is no real problem, unless you've forgotten your login information. The built in registry cleaner is very good, and can help improve the speed of your machine in some cases, but again, have a browse through the list that it gives you before you tell it to trash everything. All in all, a worthwhile download.