Amazing. I bought a set of shimano pedals for $50, and a pair of MTB shoes on clearance with my new road bike ($100 total for the setup) and LOOOOOVED them so much I bought another set of pedals for the MTB. Sooo much nicer all around. Easier to hop, easier to ride up hills. The only problem I have found (which was a similar problem with normal pedals) is getting started on a steep incline. I am sure with a bit more work I will be able to pull it off nicely though.
As someone with the same question, I am 1000000% glad I jumped at the chance to try them for $100. It is simply amazing.