They're okay.  Not as magical as I'd hoped based on all the reviews, but a nice addition to summer outfits.  I wear size 7 1/2, and at first I ordered a 7, but the straps were too tight and felt uncomfortable, so I returned them and got an 8, and they fit okay.  The straps still felt a bit tight at first but have stretched out or I've gotten used to them so they're no longer a problem.  The footbed feels nice in that it's cushioned and not hard, but it doesn't follow the contours of my foot at all and since the strap is stretchy it's really not that supportive.  My feet haven't hurt while wearing them so that's good, but I don't feel like they are the sort of thing I would want to wear for extensive walking.  More like a nice option for an evening out without having to worry about foot pain.