Audio Research Ref 6 vs 6SE


Would like to learn about the difference between ARC Ref 6 and 6 SE. Information in the web said that 6 SE involves upgrading 18 capacitors and 14 runs of wiring. And, owners of ARC Ref 6 can upgrade it to 6SE at a cost of $3,000.
How far is the actual difference in listening? Does it worth the money to upgrade? Would dealers in different parts of the world able to do the upgrade which seems to be done on site?
cclee2022
I have used ARC, Upscale, and The Tube Store. For my ARC equipment I usually go to ARC. They have meticulous break in procedures, and also, I like to support the company. But you can save some money going to Upscale. 

I have the Ref 6 paired with a Bryston 4b cubed.

Would appreciate feedback on successful amp pairings to the ref6.

 

Thanks

Audio Research Reference 160m monoblocks or REF160s stereo. Before this I paired with a Pass 350. The REF 160 is just completely different and better in every way on my system.