Checked out some reviews and did a little research on HerdProtect as I have not heard of it. I can happily say it is now in my AV arsenal.
Definitely would recommend it, it has the 68 AV engines but also it has its own false positive detector, decent scanning times (depending on your PC, but from what I have seen no one has a problem with the speed) and a great plus is its FREE

Only downside is like Hitman Pro it is an online scanner so to perform scans you need to have an internet connection.
Note: For people reading, just to be clear it is only a scanner though. Real time protection is still an important part of AV. (Unless of course you are a diligent person with your PC and have the skills yourself to erase malware, viruses, etc.)