While I appreciate the sales pitch, that is far from the truth. Having experienced it myself on 2 occasions in lab, I dont believe the "genius" bar anymore. I'll stick to my PC and it's anti-virus software. Served me better than the lab Macs.
I have a mac at home and a pc at work and I am getting the virus/spyware notification at both home and work both use different anti-virus software, it just started for me in the last week or so...