I like them because I have a MacBook (Pro), the only laptop with a usable trackpad. Four finger swipe between fullscreen apps, two fingers to bring the notifications bar in from the right, very easy to use and genuine time saving features.
Every single other laptop I have tried to use is unusable for anything other than mouse movements - the pads are too small to start with, and they get confused and think I'm trying to drag, get stuck in their scroll modes etc. Then they wear down very quickly because they aren't made of glass. Horrible experience all round.
I'll be very surprised if Apple's purchasing of Authentec doesn't turn out to be FingerWorks 2.0 - the only manufacturer capable of putting usable fingerprint recognition on their devices.