Quality and customer service are two different things.
Customer service is what it always was - responsiveness and the golden rule (i.e., treating your customers as you would want to be treated yourself). Some of the companies I have worked with on purchases were actually excellent, and others not so much.
Quality might be considered a combination of performance, appearance, and reliability. In the case of your CD example, "the sound quality is/was excellent," but the reliability (and warranty protection) were poor. You didn't discuss how the brands handled customer service - were the companies responsive, and did they try to resolve your issues (i.e., "make it right") in some way, regardless of the absence of warranty protection?