On the plus side: Totally unique and sexy design of the boots. They are SHOCKINGLY comfortable for all night wear and true to size.  I sometimes have difficulty with boots that zip since I have decently muscular/larger calves than apparently most boot manufacturers think is normal for my size 8 feet. The pics are true to the website, and the side view of these puppies is amazing. The price is right, too.
On the minus side: The upper part of these non-leather (yup, it's obvious) boots is lined and a little "poufy," since it is thicker than I would expect for this otherwise tight-looking super modern boot. Because of the soft inner lining, they do slip down a smidge when walking, which means you have to hike them up to get the full height up to your knees and get rid of the usual (mild) ankle bulge that often occurs with knee high boots.  Fortunately this little slouch occurs an inch or 2 above the top part of the stiffer upper vamp, so you don't get a cankle :)
Do the plusses outweigh the minuses? Absolutely.