I think the photo is partially deceptive. To me it looks like a very short signal path (on the PCB) design in a larger case that has healthy heat sinks on the outside. The aluminum bridge from the PCB to the heat sink seems to do the job of transferring heat to the larger heat sinks without having a PCB with unnecessarily longer trace routing. Additionally, it looks like he's left room for upgrading the reserve capacitance. For a mono amp in a fairly large case (19" x 19" x 6") it seems ok to me considering you could find several of the super mono amps in case designs that are almost half the size and several times the cost.
Besides, Who buys an amp to "look" at the insides vs. listening to what it does?
I have no comment on performance since I don't have one to listen to in my own system but they
didn't sound bad at RMAF a couple years ago. I did see a 6 moons review that I have not read here:
http://www.6moons.com/audioreviews/odyssey2/1.html