The overall quality of these mirrors seems good with one pretty significant exception.  The mounting brackets that are permanently fixed to the back of the mirrors are not at all symmetrical.  That means the location of screw hangers on the wall need to be skewed in order to maintain the proper vertical orientation.  This geometrical puzzle was made all the more difficult given that accurate measurements of vertical and horizontal axes are very difficult to obtain on an oval mirror.  For sure, though, even the slightest mistake would be obvious once the mirror is hung.  It seems that the manufacturer could have done a much better job of aligning the brackets so that wall mounting would be a simpler task.  (Hey mfgr., how about using a fixture during the assembly process to ensure accurate bracket placement?)