I'm wearing them now! They're fantastic.  I previously purchased a pair of Acorns, which were fine, but they became mis-shapen after about a year and a few washings.  While I haven't had these more than a week, I don't plan on taking them off. They do NOT have an outdoor sole, so they are true in-the-house slippers. I wear an 8 medium, bought the 39, and they fit PERFECTLY. I highly recommend these slippers.