All this talk about bags on feet and I just purchased a pair of 54 North Fasterkatts. Dry feet! I got them big enough that 2 pairs of medium thickness Wigwam socks and a liner go in easily. I haven't worn them in colder than 40F yet, but 4-5 hours of riding with lots of equipment adjust stops and they were toasty and dry as a bone when I got home. The next day I rode 45 minutes, sat in a meeting for an hour and a half, spent the same time at a Farmers market, back indoors of a couple of ours then home. Again, dry feet. The ame socks are still clean!
I've never had this level of winter comfort cycling. Not even close! And they are good riding. No issues mounting cleats (mountain 4-bolt only; I am using Shimano XT pedals) and nice stiff soles. Good walking and very good grip on the lugs. Wet floors are not scary.
Now if I can only figure out an elegant gator that runs 1" up under my tights and 1" over my boot tops to seal out water and wind (under my tights so when they get soggy, that runoff goes over my boots, not in. I tried my XC ski gators but I have to put them on before my tights to secure them above my calf or have them too baggy (and pretty dumb looking until it snows).
Ben