yes, it is probably the best out there. i also have the free version and it got rid of 900 spyware thingies on its first try! BUT it does not get rid of vx2 files. you need to get an update for those.
I have Ad-Aware SE and also Spyware Doctor and i prefer Spyware doctor. After scanning my computer with Ad-Aware SE it got rid of most unwanted files but when i download Spyware doctor it found files the Ad-Aware SE did not manage to pickup. I download bith from www.download.com for free