I like ESET, but I don't like to buy software, unless absolutely necessary. On the up side, ESET doesn't included bloat or other unneeded features like other vendors. It's enhanced PUP detection shows to be catching a lot too.
The extra features are nicely advertised too Exploit Blocker, Advanced Memory Scanner and Device Control.
FYI: Their Social Media Scanner is free for Facebook and Twitter:
https://socialmediascanner.eset.com and if you use ESET SS7 (includes Anti-Theft), you can create an account and control your devices from my.eset.com, as well as scan your social networking sites from one place.
Qihoo 360 is new on this side of the planet, so I'm not sure about using it on my main computers. They may have good intentions, but never too sure about these "lightweight" or "cloud-based" AV software.