Reporting back this morning was 28F and clear. The Giro Fuse kept my ears warm even on the faster decents (over 20mph). No annoying wind noises like the skimpy bike helmets. Nice and quiet.
About half way into work, I started getting a sharp pain in the right temple. An ear plug that I didn't bother to use was wedged between my nogen and the helmet.
The vents were closed and I used a microfiber liner. Arrived warm, with soaked head.