My transiton to clipless pedals was largely motivated by my recent purchase of a road bike. I have been a mtn biker for several years, and have always used platform.
In my search I considered both road and mtn pedals, but ended up choosing mtn pedals and shoes in the end so I would be able to walk around with ease. For the road, I looked at Look and Speedplay. Mtn pedals: Speedplay Frogs, Time ATACs, and Eggbeaters. I believe I made this decision a lot more difficult than necessary, choosing Eggbeaters after days of hovering over the internet.
I was so anxious to try these out (don't have road bike yet), that I mounted them to my Fisher, and went for a ride today. Although 4-sided, Clipping into the pedals has been a little tricky, but I imagine there is some learning curve involved. As my ride progressed, I did find it was getting easier to clip in. Accidental removal never occured, and getting out was super easy. It was almost instinctive. There were several situations where I was close to a tumble, but managed to get out every time! Once in, the float seems comfy, and I looove the feel of clipless pedals
PROs: Lightweight, teeny cleats, easy out, 4-sided.
CONs: None yet!