I had the Chromos which were great pedals while riding with a bike that has a freewheel, but they unclipped quite often when I was skidding with a fixed gear bike - which was not a "nice" feature.

I swithed to shimano spd 540's as the Shimanos do not unclip while skidding. ie. I feel safer with them. I liked the eggbeater more though in other areas... (clipping in, mud shedding, "feel" etc)