My old waterproof boots (army surplus circa 1970) started to leak and attempts to find replacements had not been fruitful. My old boots slipped on and off, were flannel lined and warm, were not comfortable to walk in but I used them for yard work, snow blowing and the like and for that purpose they were fine.  I wanted another pair just like them but couldn't find anything that was quite right.

The Keen boots are better but not quite as easy, so it's a bit more trouble to chase the dog back into the house or fill the birdfeeder in mucky weather, since the act of donning the boots must be deliberate, not just step-in.  The boots must be put on using your hands and pulling on the straps, which probably is a good thing and means they fit better, but they can't be used in quite the same impromptu fashion as my old ones.  they may loosen up a bit with wear. I have only worn them half a dozen times, but they are better to walk in than the old, have lugged soles which provide good traction in snow (not too sure about ice, but that's what Yak-trax or equivalent are for, right?).  The Keen boots also seem to keep my feet warm with a single pair of athletic socks at least down to the single digits Fahrenheit and they are certifiably waterproof.

So far, I am quite happy with the boots and would recommend them to friends.  ONE CAVEAT:  they run small.  I take an 8 or at most an 8 and 1/2 men's shoe.  I ordered these in size nine and could easily have used a 9 and 1/2, so order accordingly, even more if you plan on using heavy woolen socks.