Never liked them - the Mayo Clinic came out against them in 2012:
The Hygienic Efficacy of Different Hand-Drying Methods: A Review of the Evidence
The transmission of bacteria is more likely to occur from wet skin than from dry skin; therefore, the proper drying of hands after washing should be an integral part of the hand hygiene process in health care. This article systematically reviews the research on the hygienic efficacy of different hand-drying methods.
And the conclusion:
From a hygiene viewpoint, paper towels are superior to electric air dryers. Paper towels should be recommended in locations where hygiene is paramount, such as hospitals and clinics.
And now this - from the UK Telegraph:
Dyson Airblades 'spread germs 1,300 times more than paper towels'
Dyson Airblade hand-driers spread 60 times more germs than standard air dryers, and 1,300 times more than standard paper towels, according to research published in the Journal of Applied Microbiology.
University of Westminster researchers carrying out the research dipped their hands into water containing a harmless virus. They then dried their hands with either a Dyson Airblade, a standard hot-air dryer, or a paper towel.
According to their findings, the Dyson drier's 430mph blasts of air are capable of spreading viruses up to 3 meters across a bathroom. The standard drier spread viruses 75cm, and the hand towels 25cm.
This is exacerbated by people not bothering to do a real handwashing. Great way to get a cold or flu.