Poor Customer Service

I guess I have been really lucky ...
Had my Cary slp98 preamp upgarded and they did extra things for me at no charge and right on time, Had tech questions on my Cary 200ts DAC and responses within 24 hours.  In my office I have Emotiva monoblock xpa1s that were having a few  issues just before the 5 year warranty ran out, not only did Emotiva fix the issues but because  they determined some other things that would eventually fail a long way down the road, they replaced the caps etc all at no cost and within a few days.
I recently purchase a set of Odyssey Kismet amps from Klaus, the left amp came with an issue due to shipping, not only did Klaus replace the left damaged Amp he upgraded it and so it would match replaced the right amp.   That is what I call customer service at its best.   Maybe it's luck, maybe it is picking the right vendors, I don't know but within certain limits I am a tough to please person and all three of these firms have been exceptional in service.  You can argue sound quality, micronuances etc, but service is not subjective it is an actual event and these firms performed above and beyond.

Avalon Acoustics has totally ignored both my Emails and phone calls. I spent many thousands of dollars on a pair of their speakers, which I love. The company, unfortunately, is inaccessible.

That's a shame. One of only a handful of really good sounding speakers I have heard. 

Fortunately, I have had great experiences dealing with numerous companies. My most recent experiences were Pass, Bricasti and McIntosh. All were efficient and superb. Years back I had experience with Bryston and they were rock solid too. I have to say that it's pretty cool that when you call, reach the company and are talking to a principle and you mention your name, he knows what you own. 

RE: a highly-regarded manufacturer of tube amps.  A Psvane KT-88 blew up my amp, and I needed a cardboard shipping container  to accomodate its return it to the factory far away from me in the USA. After badgering by emails (to which I was informed that a show was coming up and they were very busy with preps for it)  I waited THREE months before I could return the unit for repair. My dealer had to intervene constantly at the show to have them send me a replacement box. I don't know about you folks, but I live for music - it is daily nutrition for me. Without an amp ....  SO much for after-market service.