I followed the advice of other reviewers and ordered this boot a half size smaller than I usually wear.  That was the right thing to do: they would have been too big in my usual size.  I found the laces difficult to work with--the boot's default mode is quite wide and it's not easy to tighten them up, but with some extra energy it can be done.  I have a fairly narrow foot, and find that there is lots of room inside, certainly enough to wear fairly thick socks if need be.  The toe box is also roomy and the shoe is comfortable.  I haven't had a chance to walk through any puddles yet, but they have been good in the snow, and I recommend them.  Most of the boots I tried on earlier in the season weren't adjustable at all and I just walked out of them.
Added note in January: We've had some slush, and these boots are not made for slushing. My feet got pretty wet.  Still, the boots dried up and still look good and feel comfortable.  Just don't expect them to keep you dry in a  puddle.