some people love them since they offer a wide variety of hand positions. Others, myself included, think all of those hand positions suck and hate them. You will probably have to try them to find out which camp you are in.

i have drops on all my bikes cept for mountain

dunt see a reason for variation

I'm not a serious mtber at all but I actually really like drops for keeping weight forward and balanced while seated on very steep offroad climbs.

you have drops on your mountain bike?

Naah it's a touring/cross frame with cantis and slightly knobby 28mm 700c tires. I use it to grind up the trails to my school SFU, which is on top of a little 300m tall mountain. There is a brutal ascent called Cardiac where I'm very glad to have the drops---basically they let me lean waaay forward and stay seated instead of standing up bobbing around.

For ****z and giggles though I'm planning on retrofitting this old Bridgestone MB-6 I have with ergo drops and tektro aero and interruptor levers.