Thiel was good to me also. They replaced 2 midgrange speakers with no charge and no questions. I have also had good luck with Audio Advisor.
What companies have gone above and beyond?
I have had a few products back to the manufacturer for different reasons. Some companies have been fantastic to deal with while others have been a disappointment. Sota was so good I couldn't believe it. Aragon was almost as good. What companies have you dealt with that provided exceptional service?