What is your definition of significant? You must have truly unrealistic expectations then as the 65HX950 has the least amount of banding of any 2012 LED set in its size class. To say you saw "significant" banding on over 20+ 65HX950s is almost hard to believe.... let alone finding the time to go to 20 different stores to examine them as well.
Not trying to be hard on you, but we see way too many newbies come in here and post statements like yours which wind up causing folks to have unrealistic expectations. Until we see a number of actual owners who can verify the x900a has zero banding, I won't believe it.. It would be absurd for a $25,000 84 inch Sony to have banding, a $15,000 84 LG to have banding.... then all of a sudden a Taiwanese company accomplish something no manufacturer has ever been able to solve which is vertical banding on LEDs.
Hey.... if this company really did reinvent the wheel so to speak, more power to them.