I use this mixer once (sometimes twice) a month.  The original beater had a bubble which eventually wore through, exposing the metal.  Even though this was a manufacturing defect from day 1, many years of my light use had passed, so the warranty was not in force and I paid for a replacement.  This week the coating on the replacement failed.  I estimate the new beater was used fewer than a hundred times.  Why isn't an uncoated beater offered?