received my version 2 of the case a couple of days ago - now they sell version "2.3" with LED descriptions engraved. Funny enough, the new engraved labels IMHO look messy (what's up with the OK, POWER and 100M?) - I prefer my 3 char long labels that I've written on the case with an extra fine CD marker.
I've measured the temperature of the case with an infrared thermometer (actually I had to stick a small piece of black electrical tape to the case, otherwise I got funny readings thanks to the reflective surface), and it measured around 40.3 degrees Celsius (104.54 degrees Fahrenheit) with the room temperature around 28 C (82.4 F).
Without the case, the larger chip would be around 45 C (113 F), the smaller chip ran at 50 C (122 F), so I guess that "heatsink" part of the case works as well