http://www.webroot.com/En_US/consumer-products-secureanywhere-antivirus.html over at pc mag got a good rating: http://www.pcmag.com/article2/0,2817,2372364,00.asp
Yes it is - it is "Prevx 4.0" with some additional components Prevx 3.0 users will be upgraded at some point in the future but we're still in the process of upgrading existing Webroot users to the new Webroot product and the transition from Prevx to Webroot is more complicated.