I use Speedplay X's. I do like the float but I have noticed that over time I do not hardly even notice it any more. My feet for the most part stay in a set position. I do however, like it when I go to climb hills and need to change my foot position slightly.

Pros
Float 15 degrees or less depending on the series
dual sided entry, There have been times I can't clip in on one side but the other works.
Great cornering, you can lean your bike over really far around curves.
Easy exit.
Get good quality even out of the $115 ones.

Cons
I have accidently unclipped twice while riding, good thing I was seated
Can be nearly impossible to clip into if the cleat is not lubed regularly or you get rocks in the springs.