Rolls back feature looks like technology from another world. I don't know how they save the system before was infected without slowing down the system or being heavy.Most important feature is rollback. Kaspersky nails the race easily.
G data, Norton give a very tough fight to him.
F secure is admirable. Looking at where it was few yrs back and now. Still needs some tuning and training @ Proactive clean up area.
Kaspersky : I don't know what witchcraft they use like black magic.. Rolls back almost all the changes when a threshold is reached. Hats off to the Russian Programmers and Eugene.