Heres a list of the engines: http://www.herdprotect.com/engines.aspx
Huge amount of them. 
The interface is simple and clean. (Screenshot)
The VM im using has no AV on it and is still infected by that Comprovante and avcheck malware. 
During the scan it shows the amount of files scanned in a graph, or maybe its showing something else there.
There is some interesting information in their Knowledgebase: http://www.herdprotect.com/knowledgebase.aspx
And there is the comprovante.exe listed which is running in memory at the moment caused by the avcheck file: http://www.herdprotect.com/comprovante.exe-20bf57abe89650fdab9f2611428f90e4f2c53632.aspx
Screenshot with the results is attached.