Excellent quality, but the details of the fabrication are difficult to work with.  Definitely not an installation job for an average DIY'er.  The mounting plates are far to tight.  The amount of extreme pressure required to place the shelf onto the mounting brackets would have cracked the ceramic tile of the shower surround.  The inserts that should slide into the wall mount brackets had to be ground down to fit comfortably onto the mounting bracket but still maintain enough friction so the shelf isn't easily knocked off the brackets.    The etching seen on the bracket is a result of forcing the shelf onto the bracket.