I used to use Look pedals on my road bike. Great platform, very comfortable to ride on...just one problem (for me)...I am a major klutz and could not get into those darn things without looking down at my feet. This is not good when you are trying to get off a starting line in a pack of 20+ riders! So, I switched to Speedplay. LOVE at first click! They're double sided, have a nice sized cleat for the shoe (which needs to be a road specific shoe) that doesn't create hot spots, and they allow for float if you have bad knees.