This is my initial review mainly because I just got the boots and have not had time to wear them much.

I ordered a size 8 since I am usually a size 8 1/2.  The boots were too big because my feet are not very wide(the length was fine).  My heel slipped up and down and I could kick them off.  I then ordered a size 7 and they fit a bit snug but still comfortable.  Everyone has said that they stretch so I am sure they will get looser.  I think the differing reviews on the size has more to do with the width of people's feet.  So, these boots do run a bit bigger and if you are a half size go down.  If your feet are very narrow, you might have to go down further.  If your feet are very wide, you could be fine at the exact size.

Update after wearing them a week.  These do keep your feet very warm and are really comfortable.  My heel still slips up and down in the boot which makes any socks I wear eventually bunch up towards the middle of my foot.  So, now I wear them without socks.  I can't go down a size more because my toes are at the front but it is fine since the boot is so roomy.