Hi Robert,
I had my Kitchen Aid professional mixer serviced three times before I 
finally switched to a Viking mixer. I bake bread several times a 
week, and the Kitchen Aid just wouldn't stand up to my wetter doughs, 
especially the notoriously wet ciabatta. When I called the company 
the first time the mixer broke, they told me I shouldn't be mixing 
bread dough past speed one on the mixer. Since I find that speed 
inadequate for sufficient kneading for most doughs, I continued to 
use it as I had been, and I had the mixer serviced another two times 
as a result. After the fourth breakdown, I left it on the curb. I 
have now been using a Viking mixer for about three years, and I have 
not had one problem with it. I was fortunate to have tried out the 
Viking at the BEC at King Arthur, and it sealed the deal for me.
Happy baking!
Steph