I did some research on Prevx on the web a while ago when it was recommended to me. Outside of Wilders Security forums, you'll rarely see a good thing written about this company.
I looks as if their free version may be scareware, overreacting to bully users into buying the free version with false-positives. Recently the company responsible for Prevx wound up with egg on their face when they accused Microsoft of causing the 'Black Screen of Death' with an official update. It turns out that either malware, or Prevx itself was responsible for the issue. Ed Bott of ZDnet put together a full story here
, which he concludes with the statement: "As for Prevx, they deserve to be laughed out of the security commmunity for their role in this fiasco."
Recently, there has also been speculation that Prevx has engineered and released their own malware into the wild
. Conveniently, initially the only software that could remove the Suverasu malware was Prevx, but "After careful inspection of this malicious file, it was apparent that the threat may very well have been created by the same company that offers its removal."
So Prevx doesn't sound like a company you'd want to give your money to - let alone a company who's software you'd want to install on your computer.
EDIT: Also, major lols at the poll options. Would you say it's a good poll? Or the greatest