I received an offer to download SpyDoctor 4.0 for $20. That's $10 off. I'm wondering what folks that are presently using it think of the app. The reviews as a whole are pretty good, with the usual people who don't like it, but I'd like to ask real people what they think. How does it compare to Spysweeper, and how does it compare to AVG 7.5. Does it slow down your start ups and shutdowns? Is it slow to access? Thanks in advance for any positive or negative constructive criticism.