I've now had these shoes for 8 months.  I got these because my instructor recommended Dansko, but I have very, very narrow, long feet.  After trying on the clog type shoes at stores, even Dansko, nothing fit right, so I resorted to ordering online so I could get narrow.  I normally wear a size 9 shoe (8-1/2 in flats or sandals), and got these in size 40.  They were weird at first because I've never had shoes like these and they always felt like they were going to fly off when I was walking.  But I did eventually get used to the different feel and now I love these shoes!  It helps tremendously that there is actually a back on the heel.  I wear them every day and am on my feet most of the time.  I read some of the negative reviews and believe that if your feet are not narrow, these are probably not going to fit right.  But if you do have super narrow feet, these are perfect!  And when they say narrow, they mean truly narrow.  I cannot wear Crocs, slides, or any kind of open back shoe unless they are flip-flops because my feet are so skinny everything falls off.