I had these bad boys for about 4 months now, wear them everyday for work and they are far and away the best work boots I've ever had.
My company supply boots, but the quality has been getting slowly worse and worse. The last pair they gave me were terrible - uncomfortable, heavy, poorly made and when they inevitably started to split I thought no way am I going through winter in another pair of them and treated myself to these.
They are very comfortable, warm (but not hot or sweaty), relatively light for what is such a sturdy boot, excellent grip wet or dry, loads of ankle support if done right up, comfortable to drive in and unless you tuck your trousers in you don't look like a paratrooper!
I nearly got the side Zip version, and initially I wished I had as you do have to loosen the laces quite a bit to get them on and off. However, now I'm glad I didn't as once they relax a bit and you get used to just taking 5 seconds to loosen the laces more they go on and off easily enough and the zip's just something to go wrong and potentially leak (unless you had to take them lots of times a day in which case go for the zip).
The boots seem very well made and like they should give faithful service for a long time.
Great product, not cheap but worth every penny if you're wearing them all day every day.