I have three pairs now: on my road bike, my cross bike, and my mountain bike. I highly recommend them.

They're better than the old one-sided road pedals because they're just as low profile and light weight, but easy to click in to because they're never oriented wrong. My favorite thing about them though is with cyclocross: release is guaranteed smooth and easy. My old SPDs used to not unclip about 5% of the time, and I lived in fear of stacking on dismounts.

Alex