I picked up a pair a few weeks ago when Amazon had them for $100.
And, of course, we've had record high temps since then. But i did get out for a ride that started with temps around 25 degrees and finished at 40ish with LOTS of stream crossings. The shoes are fantastic. I wore regular thin, polypro socks as I hadn't picked up a good pair of wool socks yet but they were plenty warm at 25 degrees. More importantly, they are VERY waterproof.
They aren't heavily insulated so I don't know how cold they'd work for but I think I'd want something with more insulation for temps below 15 degrees or so. That or I'd put a foot warmer in them. Note that I notoriously have cold feet so others may find them warmer feeling. That said, I used to refuse to ride when it's below 40 because my feet got so cold. Now, I'm toasty below freezing.
Overall, they are extremely comfortable, very dry, and fit a bit on the large size -- allowing room for thicker socks or foot warmers. The closure system is great and they are great for walking over rough terrain as well.