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?
I have had excellent experience with Arwin from Classe in conjunction with Overture Audio.
Thiel stood behind twelve year old product. One would hope that nothing ever breaks. When it does, companies should try to emulate this company.
I second Pbb with Thiel, one of the best customer service I've encountered.Another one worth mentioning is Audioquest.
My first nomination Synergistic Research; then Monster Cable Co.Theta has always been good to me --just not as outstanding as my first two nominees.
Long time great customer service from Mcintosh, Levinson and Proceed - actually the entire Madrigal group. Probably the best packing in the industry from Mcintosh.