These leggings are great.  They aren't see through, which was my first priority.  Secondly, they are warm, even when worn alone (compared to other leggings, that is).  My new favorite winter outfit is these leggings paired with a long snuggly sweater, it's amazingly comfortable.

As others have noted, the bottom is not as full as it could be, but my issue has been that it will bunch at the knees after several hours and you have to hike it up to cover the bootie.  However, these leggings are much better than many others I have where no amount of hiking is going to prevent the dreaded crack peekaboo, so I rate these as 5 stars.  I would wear these all the time if I had enough matching sweaters.