I saw one of these in action last night. It's a little bigger than I envisioned it being. I think someone said it was close to the size of a vhs tape, that's a good description, but maybe just a little smaller. It looked nice and the meters are sweet. My Sony D50 is definitely smaller.
FWIW, he had a buffer overrun/fail halfway through the first set and had to restart the recording and lost a minute or so. Not sure what was up with that. He did get 3 out of 4 sets recorded fine and I think he was using a Transcend 4gb card.