Ayre MX-R upgrade costs?

If I recall correctly, it it about $11K. From what I have heard the '20' upgrade is a significant improvement.
BTW, I own the MXR's, too, and I have a hard time believing that they can be made any better.
I would contact Ayre's Michael Wiedmair and get it from the horse's mouth. Though he can't say if it is 'worth' it, he can give you the details on what is upgraded and why it is done.
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I would contact Ayre's Michael Wiedmair

I e-mailed Michael recently because I thought it odd my AX-5's volume would cranked down when I put it in standby mode (turns out the behavior is as designed). I found out that Michael is now doing sales and that customer service is now handled by Gary Mulder who worked at Ayre years ago.

Tahnks guys, I got quoted 15k which seemed a bit steep but I guess it is what it is

I recall hearing that Ayre increased upgrade prices last December. Oh well, I’m not in a rush.
Good to know about Michael, he was always my go to guy.

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I got quoted 15k which seemed a bit steep

Certainly not cheap in a vacuum but a good deal relative to buying a new pair, no? I've used Ayre's upgrade service before and I am a big fan of not having to buy a whole new unit to get the latest and best performance. In the case of the MX-R Twenty, I vaguely call reading a post by Charles Hansen saying that they pretty much replace everything except for the chassis and, maybe, transformer.