Very difficult to evaluate, unless you've got something nasty for it to have a go at, as it just sort of sits there in the background. No test results as far as I can find from the established reviewers. I've got it on one PC to test and so far it's done nothing, but as I'm not overloaded with malware and trojans, this is to be expected. If you're just running passive spyware scanners like ad-aware it looks to be a worthwhile additional protection, if you've got live cover like SpywareTerminator, then I'm not sure what else it offers. One to keep an eye on.