If it's related to poorly supported hardware, that makes it more understandable as to why I've not had such issues enough to make me feel like I'm risking weeks of "fixing the machine" stuff by running Rawhide.
I did had to keep building the rtl8192se drivers from staging to get my netbook to do much of anything with wireless (and they were flaky, but that's better than nothing). Luckily it's upstream now and the only problem has been that I had a wired interface listed first in the list of interfaces wpa_supplicant was to manage (who knew that wired interfaces didn't support WPA2 :) ). Other than that, things have been fairly solid from kernel land.
As for non-sucky gigabit NICs, I think my desktop machines have the support, but I don't think the rest of the stuff I use supports it, so maybe the gigabit-ness parts never got tickled.