The new 2015 version of Kaspersky is very far from being a tank - it is light and unobtrusive and protection-wise it is very good. Actually having in mind the consistent top results of Kaspersky in any test, I don't think the choice is that hard. But if you have a computer with lower specs, then Webroot will be probably a better choice. I like Webroot and have been beta-testing for them for over 2 years but as others I also think their claims should be confirmed by third party testing organisations. Not that tests are a panacea to measuring the real value of a product but still it is a very important aspect. Technologies and claims are good but finding a way to prove them in a test is also important. Otherwise the testing organisations will disappear, losing relevancy and hence - business.