They are a good pair of boots overall.  Quality is not perfect though and I wouldn't pay full price for them.  I think size runs true since I tried a larger size and it was too big.  They are snug at first but after wearing them a few times they loosen up as the fur molds around your feet. Also, my wife has the more popular and expensive brand of sheepskin boots and the fur in them seems to be denser and softer than in these boots. I'm a surfer and I wear them frequently, except when I have to walk a long distance.  Walking in them for long distances gets your feet sweaty and they slip around in the boot.  I use them for winter time around the house and for before and after surfing.  They are the warmest, most comfortable shoes I own.

Update: It's been a year now and I'm still very happy with them.  They are doing great.  I use them almost every day to keep my feet warm around the house.  I don't wear them much outside because I want them to last a long time and, once they mold to your feet the fit gets a little sloppy.

Update 12/10:  Still a great pair of boots.  They are still in great condition and I expect them to last many years.  No quality problems at all!