My precedent is rooted, so I can take advantage of Avast's Anti-Theft feature. I can basically control my phone from my wife's in case it gets stolen or lost. I can get its GPS location, lock it, send messages, turn a theft alarm on, and alot of other stuff. As long as the battery is good anyway. I know there are other ways to get that, there's other apps, or something for more advanced users, like Tasker for example, but Avast's custom installation package lets me name the Anti-Theft App whatever I want, and hide its existence in my app drawer so it's not easily recognized by a potential thief. I keep avast just for that reason. I download some pretty sketchy stuff sometimes, things that may damage my system if I don't use them right, or things from individual coders that I don't know. Just a breeding ground for viruses/trojans/etc. ...but so far Avast has not warned me about anything, or detected anything. I just like the Anti-Theft I guess.
Edit: I didn't see the last post, akashik already said it