Yup . The freeware version, in conjunction w/Spybot - Search & Destroy, has helped clean up after-the-fact messes, but the $10 for active scanning to prevent such messes in the first place is, for me anyway, money very well spent.
True that. Malewarebytes is the ONLY thing that can remove that fucking Antivirus 2010/2011/2012/etc infection once you've got it.