I use avast on every device I own. I have never had any issues ever. I even loaded it on all of my wife's android and windows machines. I will swear by it.
Don't need stop believing every thing you read. DL lookout that's all you need. FYI in settings u already have a built in app checker for apps outside the market.
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I use Lookout, but I don't know if it's any better than Avast. Is there any study or comparison article?