One thing I'd like to mention is that even when I say there is noticeable difference... it takes me a lot of back and forth testing to discern it... if it wasn't for others verifying the same thing without me telling them... I'd actually half-doubt my own judgment and wonder if it's all just some form of proverbial kool-aid that I am on. In other words, while there is a difference, I've never noticed it to be day and night so to speak. If somebody switched cables on me... it'd probably take me a few hours to actually wonder if there was perhaps something different. While I still pour in tonnes of money in the quest for small improvements and to get that little bit closer to my definition of perfection, I acknowledge that USB cable for me has been more of a fine tuning exercise than a game changer.
Having said that, I really can't wait til my new DAC arrives so I can test my Black Cat Silverstar on it. If that isn't an obvious improvement I will be very disappointed given how much I spent on it.