CoiL
Member of the Trade: Wood Audio Accessories & Modifications
Is there actually any real difference in sound between them ? Seems unlikely.
Yes, there is difference.
I would highly recommend Sound Unlocked Rockbox if you are willing to give it a try! I don't like the stock Rockbox sound a whole lot either, but Sound Unlocked is fantastic!
Must be placebo effect. The perceived change does not affect rockbox at all. See medmitry's comments.
No it`s not placebo. Have You even tried it or just constantly bashing it?