It works really well. It decreased my desk top (windows7 64 bit) by almost 50%, and my old laptop (vista 32 bit) by about 10%. I cant really tell a speed difference because I keep them both in good working order anyway. But this is just one more step to insure your system runs to the best of it's ability. I can honestly admit this is the best registry defrag (or compressor LOL!) that I have used and you can see the difference in between uncompressed and compressed, so you know it's working. If you ever start charging for your programs I would still use them. Free is nice, but I don't mind paying for quality. You have been really doing an excellent job helping people and creating good, useful and easy to use products. You are the best hands down, my hat is off to ya bud!
Oh yeah, did I mention...keep um coming..LOL!
Chris