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Hi,
Super question! IMHO cabling is very, very system dependent, so what you will possibly receive (at best) in reply is honest personal answers to your question, but those answers will all be system dependent.
That's why Robert's (RSA)45 day return policy, and the opportunity to borrow an SR USB cable from the Cable Company are important options for end-users.
Remember that it takes time for the cables and the electronics to settle in to changes made on this level. Initial impressions are not always the most valuable. Give the cables and system time to find themselves.
Yes, USB cables do make a big difference... and that is not just a subjective opinion.
The RCA dog would easily discern the difference!
I A/B'd the cables plus a regular USB printer cable for my highly sceptical son and his wife ("Dad... look, data is just data... ones and zeros... data is data"), both argued with great redundancy and circularity that data is just data... and both left the house after listening to the A/B muttering and sputtering... wrinkling their noses realizing that another axiom in computerland had just bit the dust.
:) listening,
Ed