I bought these to use for walking through muck and mud, but they also work on rainy days and even in snowy days (worn them in up to 3-4" of snow).  Easy to clean, really easy to slip on and off, and they fit wonderfully due to the neoprene sleeve inside the shoe.

The price is right too--about 30% cheaper than other, comparable, more "trendy" shoes on the market.

They look a bit silly--I call them my "Duck shoes"--but hell, they work beautifully.  Recommended.

Edit: Feb 2012 - Been wearing these for two years and they're still like new, and incredibly useful. I'm never going to be without a pair of these again.