While I agree that they do keep your feet really warm, there is however a basic flaw in the design.
If you have to do even the smallest amount of walking in them, then you'll wear a hole (or two) where the overshoe material comes into contact with the floor.
The only walking I do in mine, is from the house to the integral garage, then just a few yards when I get to work. But within two weeks I had two tiny holes underneath.
If only they would have reinforced this area then they would be an excellent, but at £50 a pair........
So based on that, the Endura ones get my vote, even if they do look like sawn off wellingtons!