My Metrum Octave arrived today, and here are some pictures to whet your appetites - one with a CD case for scale.
Will post impressions when I've run it for a while . . .
http://www.revalia.co.uk/metrum/front.jpg
http://www.revalia.co.uk/metrum/back.jpg
http://www.revalia.co.uk/metrum/scale.jpg