I have wanted to buy a few GuruPlug Server - PLUS plugs for some time now.
I have been checking Globalscale.
Having bought one, waited forever to get an uprated one and taken it apart to find out why even with a fan it get's so stinking hot, I'd personally advise you to stay far away. The only way it's going to be reliable in the same case is if they make a 1/2 or 1" spaces to go between the two halves and mount the fan so it does something. All it seems to do now is make the ethernet connector seem cooler. It can't move any air as there's no space around it and the took the heat sink/spreader out so the fan would fit. Taken apart and with the 2 halves side by side and the fan tilted over at 45 degrees so it blows on the processor and it has a chance. It's rather hard to imagine that anyone who worked on the design team has a clue about power dissipation.
Other than that, it's a really cool box. I was going to open it up and put a leftover I5 heat sink on it but there's no where to mount it any more.