Great exhaust fan! I ended up getting more.
I have two of these; I initially installed them with the 100mm duct. With the 100mm duct, it was okay but not as good as I expected. So, I replaced the duct with a 150mm duct, and it was significantly better. It made much less noise and the mirror didn't fog up once.
My ducting goes to my eave, so they pinch down a little, so others may have had a better experience with 100mm duct. But 150mm made a world of difference.