Well, we can't exactly know what's inside the program, but our AV checks, usual runs, closer looks at the task manager did convince us that it's not harmful. I (or anyone here, except the BS developer if they're here) can't guarantee its safety. You probably shouldn't do very sensitive things at it, I guess. But me and a handful of people I know use it frequently, one even just runs Clash of Clans from it daily. Never saw an account intrusion or virus alert though.