McCormack Silver vs. Gold revision for DNA-125?

Has anyone heard the DNA-125 with the Silver revision as opposed to the Gold revision? If so, what is the improvement? How about the silver revision over the stock unit? My DNA-125 (stock) is quite nice, but a little grainy and grunty, not exactly liquid. I am considering the Silver revision (at a cost of $800), hoping that this will clean things up. How much of a difference will this make, and how much better is the Gold revision? It is 2x the price: is it 2x the sound?

Basically, if I get the silver revision, I will be into my DNA-125 for about $1550 (I purchased the stock one used).