Great program. I run it alongside MSE and Immunet Free, and between the three of them, they seem to catch just about everything (and a little too much when we're talking Immunet.)

For those looking to register the full version--I recommend it wholeheartedly--you can pick it up at Amazon for right around $20. I've also seen it as a Newegg Shellshocker special twice for less than that. Worth far more than the price of admission, and it's a lifetime license, to boot.