I have Ultegra (SPD-SL) pedals on my road bike and eggbeaters (just the plain ole' eggbeaters, not one of the platform varieties) on my cx/commuter bike.

I like both. I definitely prefer a road-style (SPD-SL, Look, etc) pedal for road biking -- I feel like I get better power transfer and they're just so solid.

But, the eggbeaters are super easy to clip in/out of, and they shed slop like nobody's business. Only issue I've had is that sometimes I feel like my cleat is loose, but when I go and check it, it's not -- gotta figure out what's going on there because it's distracting.

I'm not sure if eggbeater cleats are compatible with road shoes -- if I had to guess I'd say not with most (more traditional road cleats have three screws spaced in a triangle with a wide base -- the eggbeater cleats are more like spd mountain cleats, two screws set close together). I'm sure someone else will give a definitive answer though. I'd worry about the slipperiness of eggbeater cleats on road shoes if they are compatible. Everyone hates the "duck waddle" you're forced to do with road shoes and cleats, but the big road cleats do give you a little traction when otherwise slick road soles would have none. (I use road shoes for my road pedals and mountain shoes for my eggbeaters).