bad like a 500 pound woman in a small bikini ;D
about their engine
http://celframe.com/supportsuite/index.php?/Knowledgebase/Article/View/363/50/what-engine-do-you-use-and-do-you-create-you-own-signatures-for-celframe-free-antivirus
some more info and testing http://forums.malwareresearchgroup.com/viewtopic.php?f=20&t=581