And the fact that Qihoo recently got busted in a Volkswagen-like scam when their "anti virus software" was tested does not inspire confidence in their business ethics either: http://www.computerworld.com/article/2917384/malware-vulnera...
The wikipedia page for "360 Secure Browser" says: "High usage numbers may be due to the browser being difficult to uninstall and a warning pop-up that appears when a user attempts to install another browser, claiming that the other browser is unsafe and should not be run." https://en.wikipedia.org/wiki/360_Secure_Browser
This article gives a bit more context: http://www.digital-dd.com/qihoo-browser-war/