I'm using DU Speed Booster and and old version of Baidu Mobile Guardian which has been translated to English. They actually both appear to use the same scan Engine (they are both published by Baidu). But, I'm using them for their optimisation and cleaning features, not becuse of the antivirus components. All my phones and tablets and the majority of electronics I buy are Chinese brands, so I have no issue with using Chinese security software. I even have all my texts backed up automatically to the cloud by a Chinese texting app.