I have never been able to wear these type of high boots as usually they're too tight around my legs, especially with thick jeans. However these are really comfortable and may be too big if you have very skinny legs. As far as the size goes I knew they would sell out fast, so although I wear 9.5 in average width shoes and 10 in narrower shoes I decided to go with 10M. To my delight it was perfect. I used scotch guard spray to seal them which was a great decision as they have helped these shoes remain mark and spot free despite snow and salt.

After using them last winter and during this winter, they're my favorite shoes. They are the ones I pull out on days that are 10 or 20 below. I read some advice about wearing these barefoot, and I've followed it as my feet tend to get too hot in these shoes otherwise as they are very cozy. The sheepskin lining has this amazing ability to stay cooler or warmer based on weather conditions. After a winter they stretched a little and got a little bigger, but I prefer the loose and comfortable fit to tight shoes. They are so comfortable to walk in and the only shoes I want to have on in the winter when walking in slush and snow. I feel like I am in my cozy living room slippers when wearing these boots. Although if you have really deep snow you might be better off with some more waterproof shoes with deeper tread.

Do not buy the EMUs with wool as they are nowhere as nice as these premium sheepskin boots. I also bought a couple of Khombu brand boots and was severely disappointed as they look pretty cool but are not made for negative temperatures like they claim. These on the other hand are great even in -20 deg F Minnesota weather.
Update: After 2 seasons these boots are still holding up well. I can live in these all winter!