We have a serious problem with our two cabinets--the glass shelves are a little less than a half inch too short to go into the shelf slots.  We don't know why this has happened--is it a manufacturing error?  The instructions do not address this problem--perhaps there is a trick to installation of the cabinets. Also, as others have noted, the mirror lights are not very bright, and the up and down arrows to control brightness do not operate correctly.  We will update our customer rating if/when this is resolved.
UPDATE:  Our builder realized the walls of the cabinet were so pliable they actually bent outward slightly in the wall space.  This made the cabinets slightly too wide for the glass shelves to sit inside!  He added shims to support the cabinet side walls and keep them straight.  Then the shelves could sit inside.  So I will re-rate the cabinets as 3-stars.