Douglas Brown, Tech. Rep. at Sonic Frontiers is excellent, as is Todd Sutherland, Customer Relations at Madrigal. I bought two used Levinson components last summer and Todd asked for serial numbers then immediately gave me significant "remaining warranty". Steve McCormack at SMC, and Richard Vandersteen at Vandersteen Audio are also excellent.
Best Customer Service (Manufacturer)
There are many audio companies that are competing for our hard earned dollars. The impressive guys are the ones that stand behind their products. Nothing is more disappointing than the companies that "take the money and run". One of the notable good guys that take their accountability seriously is Bryston. They stand behind their products with an unheard of 20 Year Warranty. What are some of the experiences with Bryston and the other "Responsible" audio manufacturers?