Yeah, I bought one. Then found out that none of my HDMI cables had the magic activeness to it, so it didn't work. There it sits on my shelf... I tried a few different tutorials on getting it to work, all to no avail. The damn thing turns itself off and then the pi loses power...
In my setup here, though, I wasn't terribly clear, I'm using a pi clone that needs pretty high amperage for good performance. If I could figure out how to get the lapdock to work, I dont think it would provide enough current... .or maybe it would. Frustration has me done with that thing.
Edit: Maybe I'll put some eyebrows above the speakers...