Wonder what the differences are between the two (other than the M2 seems darker). Maybe a different material? Using iStatistica Pro on a much older mbp, there are heat pipe temperature sensors as well as cpu, cpu proximity... Would be interesting to see a detailed description of active cooling mechanism.
Looks like M2 heatsink is wider than M1, but not as tall. Can't really judge total cubic inches or centimeters from the picture, but looks about the same ballpark. Would also be useful to know how heat is conducted to the dual fans. Is fluid used, or is heat piped thru solid metal (or something else)? I assume there is some kind of detailed training manual used by repair staff. I've seen such manuals for a number of minicomputers in the past. Wonder if it comes with the self-repair kit rental (or is available either online or in print form)?