Has anyone heard a DNA-1 with the Gravity Base upgrade?

McCormack DNA-1 or (better) DNA-1 Plus - yes

Pillartech Gravity Base - why?  Do you really think it's going to make a substantial difference?

My advice: buy a nice piece of end-grain maple butcher block to fit under the amp and use the rest of the budget to buy a ton of LPs or a lifetime subscription to the streaming service of your choice.

@br3098 thanks for your response; I didn't realize I was unclear.  I was referring to McCormack Audio's Gravity Base System upgrade, which involves taking apart the amp and integrating the electronics with a brass base in a specific way.  I had never heard of the Pillartech approach, but from their website it appears to be just a more rigid rack on which to place the amp.

Sorry, my bad.  I am unaware of this offering by McCormack.