I bought one from Deal Extreme and I am quite happy with it. Now, this is my first use of a flash that's not built into the camera, so anything is pretty impressive to me from that point if view!
Seriously though, it works as a slave and with the camera's TTL mode. It also clears my 18-200mm with hood attached, which was a big problem with the D7000's built in flash.
Basically, from my little experience, this is one amazing unit. The manual does mention that it's not meant for full frame cameras so that's an important caveat. Oh, and recycle time is very quick using Eneloops.
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