Well, i am using ESET since 2007 and i never get infected by any kind of threats even Autorun
Never slowed me down even while playing (thanks for full-screen mode).
There are no annoying pop-ups to allow/block a software for firewall, a peace of mind auto-protection
I've tried every anti-virus softwares u can imagine with every year new versions, i find that ESET still and will be the best and the lightest AV.
Thanks,,,