I've been using the Spy Sweeper (WITHOUT ANTIVIRUS) for over a year. Before I bought it, I used the Spyware doctor, version 3 or 4. Excluding cookies, the Spy Sweeper at that time reduced my infections (active protection) by about 90 %. Soon my subscription will expire, and I am faced with the question whether I should renew it. I use elevated security settings. (Including, but not limited to, a customized sweep that also scans for rootkits, unlike the 'full sweep') I know of basically two ways to see how well the Spy Sweeper works: first: no infections, second: number of impacts on it's shields. However, at the moment I also use Counterspy, which is very good. I'm using McAfee virusscan Plus too (but plan to ditch that). I haven't found any spyware on my computer (except cookies) for a long time. But because of this combination, I really don't know how well the Spy Sweeper works. Spyware has changed, the version of the Spy Sweeper has changed. The number of impacts on the shields are extremely low. If I check out users' (?) experiences on download.com, I see some very negative reviews. But that is the case for almost any program. I suspect that at least some reviews come from competitors. Some people call it a resource hog, but it's not that at all on my computer (unlike McAfee!). Regarding 'Webrot'; questionable attempts to install in a sneaky way the ask.com toolbar and a search assistent (but McAfee shares it's data with Doubleclick, which shares it with ... nearly anyone) also gives me pause. What are your experiences ?