So if a company makes 4 levels of the same product, even if they don't explicitly state it, they are inferring that there is an improvement in sonics at each higher level. Who knows if if is 5, 7.5, 10 or 15%. I don't take the claim of an 15% improvement as evidence this is a bad or dishonest company. Just my take.
You know when you are dealing with a BS company....
...when you read statements like this:
"You can expect a 15% to 20% improvement in sound for each level as you move up the line. The improvements are in soundstage, resolution, realism, musical presentation, impact, etc."
Me: yeah, the humidity in my room changed from 44 to 45% yesterday, and I immidiately noticed that the realism dropped by 3.4%, yet the musical presentation actually WENT UP by 8.3%. I was able to compensate by turning the lights on in the kitchen and changed my socks. Puh, that was close.