First off, these shoes take some serious breaking in; for the first few weeks of wearing them, they were seriously uncomfortable - hard, unyielding and poorly fitting. They're also extremely heavy - check the weight before you buy, and be sure you want to lug that much shoe around on the end of your legs.
After that, though, I found them to be extremely comfortable, saving me from sore feet even after a whole day on them. The soles gave me a lot of confidence in the wet and snow, also, being very grippy on notoriously slippery surfaces like wet train station floors.
The uppers are very hard wearing, showing barely a scratch after 2 years of heavy use.
If the story ended there, I'd give them 5 stars.
Unfortunately, the quality of the sole is highly suspect. After 2 years, the outside of the right heel has worn right down to the line, and these soles are normally very thick (well over 1cm at the heel). The rest of right sole, as well as the left sole, is still intact. This imbalance has rendered the shoe unwearable, which is a crying shame given how good a state everything else is in.
I'm tempted to buy another pair, but questions over the build quality, and the difficulty in breaking them in to start with, puts me off.