I'm just getting started with clipless, after 15+ years of platforms. I have platforms on my road bike, and Crank Bros. Smarty pedals on my mountain bike. This past Sunday was my first mountain ride with the clipless, and I was treated to 3 falls directly related to the clipless learning curve, and yes, the second one had an audience.

I've got a second set of Smarties on order for the road bike, I'm hoping having to clip in for my commute every day will help with the muscle memory.