How good is 360? My friend uses it but most anti-viruses besides Avast! Don't seem to run that well for me.
Pro:
Running flawlessly, feels light,gets programme updates quite often, and their own detections (I think those are all cloud based) are fast reacting to new threats, SUD reports can be answered within hours, at least in the morning after SUD (on weekends, they seem not to work).
However, QTS360 tends to whitelist chinese PUP/PUA, do not expect them to be found during scan (however, BB/HIPS can pop up if something tries to amend registry entries).
Very good HIPS/BB, auto-declines after 30 seconds, let's the user decide on what to do (description of the possible unwanted change included - e.g. registry entry).
Free.
Contra:
They cheated at some AV tests (
Antivirus Company Qihoo Censured for Cheating in Lab Tests)
They whitelisted malicious software without testing, at least two current articles to be found in MT News section (
Chinese Hackers Bribe Their Way onto Qihoo App Store)
You haven't got expert settings like in in Kaspersky or Avast!, only those Security Presets and some options in "Settings"
Some HIPS/BB actions are done (allowed) automatically, this can be an issue with those chinese PUPs/PUAs.
Feel free to visit the Hub, I'm testing QTS360 cloud only, works very very well. Decide on your own regarding those Contras.
EDIT: Here's the second article:
Sophisticated Bribe Scheme Helped Crooks Whitelist Malware on Chinese Antivirus