These work well for one season and then they fail.  The first winter they were a good, warm, waterproof boot.  They're high and somewhat heavy and obviously that affects how comfortable they are to walk in.  They don't offer the support of a lace-up boot but they are a lot easier to slip off and on as you go in and out of doors.  As long as you're expecting to wear a big boot, these are warm and dry and far more comfortable than a regular PVC boot.  But they're also about 7 times more expensive and they don't seem to last as long before the rubber cracks.  The boot flexes at the back of the toe-cap when you step, and over time the rubber flexing in that area fails and the boot cracks, even before the sole is very worn.  When they're cracked, water seeps in and soaks your socks.  I can't really afford to buy a new pair of these every year so I'll have to find something else.