Can you link to an impartial review site? Manufacturer will always say their product is the best. Besides, I can’t find any useful comparison there.
For example if you take a site like
AV-Comparatives, they have carried out several extensive tests and benchmarks to compare some of the most popular virus guards. Viper is not there for some reason

. Have a look how detailed and rigorous their testing procedures are :
I'm talking of that kind of benchmarks, not some ads or promotional material found on the company's website.