I don't like them. The braking position is completely uncomfortable and awkward feeling and I just don't feel like I have that much control over the bike. I've tried drop bars at two different times in my riding life and they just don't work for me.
I will say that most people do seem to like them, especially for longer rides, which I don't participate in. I ride more like a kid in that I do a lot of sharp turns riding around things, riding on narrow sidewalks at high speed, etc and almost never more than one hour. MTB bars with about 10 degrees of sweep back and however much rise is needed to get them a couple of centimeters above the saddle are my preference.