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
@audioconnection Good to hear about the metal remotes, I was worried there for a few hours ...
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I have heard nothing but good things about Trent. He explained their metal remote manufacturer had suddenly stopped making them or when they out of business. He wants to have hands on control of the company. I think the stint with MacIntosh may have been a good thing… they are finally using contemporary electronic design and layout equipment. But he is not a large corporation… he want excellence. I think the divorce will be good. He immediately promised me metal remotes for my components when I complained about the plastic ones. 
I apologize for hi-jacking the thread but I am approaching 1500 hours on my Ref 6 and will be buying 6H30PI's. Seems like my choices are ARC and Upscale. Any other suggestions for top quality versions of this tube?
I love Upscale for tubes so I will probably just pull the trigger with them. They offer an "ARC selection" grade but are out of stock of EH version and just have the Sovtek version (which is likely fine).