Update!
For the last 10 years I have had Hunter wellies. Great to walk in, but no insulation.I got a pair of Muckboots for Xmas and am well impressed. Just like Paul, you forget you've got them on.
They can't touch the Hunters as a walking boot though. I took the dog out on Sunday and got lost in Thetford forest. Ended up walking 10 miles (at least the dog was shagged out and gave no further trouble that day) and now have a blister on my left heel.
To be fair I don't like to have an enormous routemarch when I'm fishing so this isn't really an issue. They are also much easier to walk in than Skeetex boots or the Sundridge equivalent.