CAESARV  I purchased this antispyware back in 2008. I am still asking myself what it actually does. The fact that it asks your password makes it very suspicious. I decided to use it only for checking tracking cookies, since it is silly to scan all files each time just to find .. nothing.

Big surprise: MacScan always finds the same tracking cookies. I eliminate them, run MacScan again immediately thereafter and, miracle, it detects anew the same cookies that were eliminated one minute before. In the meantime I have found a way to eliminate those tracking cookies for real: go to the browser, check preferences/cookies and delete them yourself. Of course it is quite cumbersome and does not justify the price payed for MacScan. About detecting troyans, my feeling is very negative, suffices to check the list of them in the .plist file. Many programs in the list are no troyans at all. To become a really good proagram, MacScan has a long way to go.  
(Version 2.6.1)