As somebody who uses Eggbeater SLs with Sidi shoes, I have no problems at all and have never been found lacking for platform when standing up and sprinting or climbing. That said, I only ever take my road bike out if I know I'm going for a ride of considerable distance and know that the only time I'm going to be off the bike is to walk it to and from my door to the street.

The downside to the Eggbeaters is that if want to go for a short spin down the block to the grocery store or something and don't want to bother with your dedicated shoes with cleats, it can be somewhat of a pain trying to pedal on them. In situations like this, the Candies or Mallets may be of more use to you with their wider platform.