I played in a session Friday night at 8:00 pm. I'd read the rules, but was eager to see how it played with an experienced GM. I'm pleased to say that it was a lot of fun!
I'm sure that it helps to have players who are good at improvisation, but the ideas started flowing right away. The bonds generated a quick backstory for the group, vaulting us right over the "getting to know you" phase of a traditional RPG.
I played a halfling thief named Harcourt, and while I had a run of bad rolls, I was able to deliver at least one effective sneak attack.
We ran through several encounters--orcs attacking a tavern, a troll at the crossroads, and more orcs (and a hydra) in a cave--in under two hours. The GM used a set of geomorphic dice (
http://www.dungeonmorphs.com/dice.shtml) to generate the caverns on the fly, and the next day I tracked down the dealer and bought a set for myself!
I'm currently running a 4th Ed. D&D game, but would strongly consider starting over with DW when the current storyline wraps up.