I ride fixed pretty much all the time. I don't know about you guys, but when I"m really cruising at a high cadence, and suddenly the road becomes super bumpy or pot holed or whatever, I feel way out of control. In this situation, I'd so much rather have a free hub and float over the problem spot.

And as far as climbing goes, yes, on short not-too-steep climbs, fixed will feel easier and outperform most others. But there is no way I want to take a fixed gear up a real mountain, especially against a bunch of in-shape roadies with good gear. Don't go making blanket statements about how great one can climb on a fixed. Remember, they are designed for use on the track....don't usually see hills on the track.