I was missing a backing piece for the cabinet area (only had one of two) and had to wait for the manufacturer to supply me with the missing piece only to have them fail to cut out the hole for one of the fixtures.  Luckily it was on the top edge so I just used the other piece as a template to trace the hole and had to use an exacto knife to cut it out.  So yeah not super happy, looks good after assembly but had to jump through a lot of hoops that I shouldn’t have had to.