The newer ones are better. The high speed ones only take about four minutes to get your hands dry enough to use your pants. And the Dyson AirBlade models actually work, but still take longer than using a paper towel.
I have been known to in fast food restaurants to walk out of the bathroom with wet hands, go to the napkin dispenser, and use a bunch of napkins to dry my hands.
Suffice it to say, I loath hand dryers.
And now I have another reason: they are unsanitary.
According to a Leeds University study, the hand dryer splatters bacteria around. The air around hand dryers has 27 times the bacteria than the air around towel dispensers. (And, towel dispensers don't blow that nasty air on your hands):
The study shows that both jet and warm air hand dryers spread bacteria into the air and onto users and those nearby.And now we have yet another reason to hate hand dryers. They are filthy.