This is Burton's stiffest boot for women this year, and this boot fits like a dream. At the end of a day with riding with this boot, I'm in no rush to rip these things off my feet like other boots - they're that comfortable!
My feet fit very snugly - I find the boot runs true to size at a 7.5. So far I've ridden on hardpack/ice, and this boot provides nothing but exceptional fine tuned control. I don't get any lift in these boots - if you do, try slamming your heel down into the ground a few times after first putting your foot in. You won't have any troubles after that.
The boot also comes with plastic inserts to stiffen the boot even more to your liking, extending the life of your boot as well. The liner is wired to provide heat with a battery pack that can be purchased separately. The liner is also heat moldable, which I've also gotten done.
Overall, I definitely recommend these boots, especially if you like ripping down a mountain fast.