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So-So. I've used VeriFace before, which I think may only be on Lenovo machines, and it logged me on quickly and easily. It's good enough for casual security, if that term has any meaning. It would probably be sufficient to deny access to the guy in your office who likes to play tricks on you. I haven't check this myself, but I have seen tests of some facial recognition software that is easily fooled by a photograph. Considering the ubiquitous presence of mobile devices with good cameras, it wouldn't be all that difficult for someone to take a snapshot of you and potentially defeat the software. Perhaps the software has improved since those tests, but I'm not sure.