love the multi-release
I was surprised when my M520 pedals same with the black, single-release cleats. I tried them and hated the setup. I thought they'd prevent inside release (like Speedplay Frogs), but they don't, and they made outside release really difficult. I put the multi-release cleats on and while they obviously don't prevent inside release either, they do make outside release very comfortable, close enough to Frogs that I've found my replacement system for the now defunct Frogs.
Victor K.