For general walking, I've never got on with them. Not comfortable enough (though this was quite a few years ago).
I did try them for jobs where I knew I was going to be standing in water most of the day (eg. teaching river crossings, water searches, etc). Was better than normal socks, but not enough to be worth actually buying a pair when I gave the borrowed ones back. Now when I have those kinds of jobs I just use my neoprene socks from caving and my feet stay toasty.
On the other hand, I love my Sealskinz gloves. They are originals, the thick woven ones. As with the socks, they aren't designed to stop water reaching you, just they themselves don't soak it up. Good for general use and brilliant when having to plunge a hand into water and then carry on for the rest of the day.