I'm not sure if you're referring to the Crank Brothers style of pedals. They have a version with a platform, with the eggbeater in the center. I have them on my road bike. On top of the pros Liza mentioned, they don't float too much, and are pretty stable. Also, you can wear regular shoes and ride too. I really like mine.

http://www.crankbrothers.com/candy_sl.php