I have been VERY happy with these.  They are actually a bit too warm for summer, but I am very much looking forward to them keeping me toasty as fall rolls in.  The styling is very cute, the detailing is excellent, and these are a real quality product.  They have a slightly higher "ridge" behind the heel than some other mules, which stays up fine - I can see if you ordered a size slightly too small this might be annoying as your heel would crush it down, but I ordered up a size (OK, let's be honest, it was probably half a size).  Nice snug feel all around, feels more substantial than a slipper, very cushiony footbed.  Grab a pair!