said by Noone :

I tried their version no. 3.5.0.21 and used it for about 7 weeks before uninstalling it. It had a medium learning curve, which took about a week to learn all my programs and their functions. After that it was smooth sailing. The only thing that would slow me down is when it did a system scan; would take about 15 minutes and brought my computer down to a near crawl.

*Warning!!!* After I uninstalled it, I ran a SnoopFree Privacy Shield to detect any keyloggers and upon reboot it detected "TfKbMon.sys" was "acting like a key logger". So I deleted that file under C:\win\system32\drivers. The next day I booted my computer for the first time and couldn't use my usb keyboard or mouse! Long story short, the uninstall obviously didn't complete its job to the fullest and I had to load the live disc of Ubuntu to get access to my computer, wherein I copied the file back into the driver directory and rebooted with kb/m working fine.