I love my Mixer! I have had my mixer for about 10 years, but I have had to replace the beater blade several times due to the coating that chips off. I always hand wash the blade and it does not rub against the bottom of the bowl.  

I used it again last night and had to toss out my dough as another piece flakes off into the batter.  On top of that now my mixer is making a terrible sound as iff it is wearing out.  I fear it is time for a new mixer.  I had hoped it would last longer than 10 years.  I could see if i used it daily, but I use it only a fe times a month.  Very disappointed and not wanting to replace yet another blade.  After redoing the reviews of the burnished blade, I don't know if I even want to try that one.