I wanted to supplement this review with a quick video. Every video I have seen on the various retailer sites makes the Vortice seem like you need a manual to get them on and off, and the reviewers always fumble with the fasteners and/or assemble them wrong.
If you are leery of buying a boot that takes 10 minutes to get into, don't be. You can get these on and off fast. here's proof:
YouTube - Sidi Vortice - easy on, easy off‏