I had just upgraded my BTS 2012 to 2013 version and its really great. I was really impressed with it after I scan my system. BTS 2013 has scanned more than 1,200,000 files in my system but it took almost 5 hours to finish the scan. It was really like scanning with Hitman Pro that almost all files in your system are scanned and this is really good. Compared to other antivirus programs I had used before, its only more than 500,000 files were scanned. No doubt, Bitdefender has the best antimalware engine.