I played it. I played as the Shade Wizard. My girlfriend played the Drow Assassin. i didn't get to check out everyone else's characters though. That was actually part of the adventure set-up. The characters didn't know each other previously (except for two of them), and each character had their own background information, and own motives (which, as you can guess, turned out to be conflicting). Our group had a lot of fun with it, and kinda treated it like a "Clue" type adventure, trying to figure out what everyone's goal was.
So, as per the material previewed: I thought the assassin was pretty under powered compared to the non-Essentialized version currently in the game. However, I thought that the adventure itself was really well put together, and a lot of fun.