I'm using ESET. Let's see why ESET is better than Quihoo:
1) ESET has a firewall;
2) Lighter and smaller (~90 MB vs 380 MB). I know that Quihoo has 3 engines, but the cloud one should take ~20 MB at most, the same with the self engine.
3) Low RAM usage (~45 MB vs 160 MB).
4) Better detection and protection rates than Quihoo.
That's my opinion about those products.