I initially ordered these in a size 8 which is a half-size larger than my normal shoe size. When they arrived I tried them on and they were incredibly snug even with a normal weight sock, so I returned them and ordered a 9, which is roomier. I think the reason they run so small is that the footbed insert that comes with these boots is very thick. With the first (size 8) pair that came, I removed the footbed inserts and tried the boots on and they fit fine, but I believe the insert is part of the insulation. So, if you're a person who likes to remove the footbed inserts from your shoes, you might be able to get away with ordering these merely a half-size larger than what your foot actually is.
All that aside, they are incredibly light-weight and pretty comfy. I do think that the toebox is a bit tight even in the larger size, and I while they are warm I don't believe they're really as insulated as they claim to be. I wore them yesterday afternoon with a pair of wool socks over tights in roughly 30 degrees for about an hour and my toes were getting chilly. Luckily they're so big that I have room to add another pair of socks (or toe warmers) if I'm going to be outside for a longer period of time. But I like that they're not stiff, I don't have to break them in, they have good tread for better safety on the ice, they are easy to get on and off, easy to lace up quickly, and they can go over or under my pant legs, and they look modern and cute.