Have owned Norton 360 since it's debut - 3-5 years now. Not ONCE have I had an issue with spyware, malware, viruses, etc, etc. Early on, it was a resource hog, but as the product has matured, it has a smaller and smaller footprint, now virtually unnoticed.
Sure, you hear alot about cost, 'overhead' on the PC, and such, but there is NO substitute for 100% success in protection. I will continue to buy this product for as long as they make it. There are others out there, cheaper, slimmer, etc. - but you get what you pay for.