I bought an Uptone Audio etherREGEN when they first came out. Recently I was having some difficulty getting it hooked up in a new configuration, and emailed the company asking for help.
The next day, I got a phone call from Alex Crespi, who owns the company and designed the device, asking me more about this issue. He had looked up my history and found I'd bought it six and a half years ago. We talked at length, and he emailed me a couple of solutions, and detailed instructions for updating the firmware on the device.
Needless to say I think this is extraordinary customer service.