Been wearing my Outdoor Research Firebrand gloves.
Temps have been in the mid 20's to low 30's so far.
I find in that temp range wearing them without the inner insulating gloves works really nicely (the inner gloves just add too much warmth at that temp range when active).
So far, January is looking rather mild for us. Temps should be around the mid 20's until the end of the month. So, unless February gets cold, which is possible, I don't think I'm going to have a lot of opportunity to really test out my Mutant mitts or layering of my gloves. Maybe we'll get some subzero weather though and I'll be able to give you my impressions.
I've got this PCU layering thing down. First winter with the full 1-7 PCU layers (except for 4) and it's a blessing to finally be able to work hard outdoors without sweating or freezing. Been using a little graphic chart the U.S. Army did for how to dress depending on temp range and activity level and it's been really handy.