So far- I am very impressed.  These fit very well (true to size) and are very warm.  I read many reviews on many different styles of Sorel boots and was trying to decide between these and the Joan of Arctics.  I liked these more because it feels like there is more sole insulating my feet from the snow/ground.  I do not feel they are extremely heavy for what they are.  In a good snow boot, a little heft is desirable for my personal taste.  I will be testing the -40 rating on these... Winter in Montana is no joke!