Upgrade Theta Miles to Balanced version

I have an unbalanced Miles that I run my amp into. I like the minmalistic approach. I've read on Agon that the balanced version is superior even when run single ended(RCA). I would be using RCA's. Is this true?

I'm considering updating my Miles. I believe the price for updating is $500.00,is it worth it?

I have a Miles as well. What are the upgrades that are available? Can they be done by a dealer? Thanks.
Why not sell yours and buy a balanced version. I believe there's curently one for sale here. (I have no affiliation with the seller)

If I had the funds I'd offer to buy yours.