Audio Research I/50 integrated?

I’m looking for a simple, but classic integrated tube amp for sensitive speakers. I have seen this amp, watched the Darko videos, etc. but I’m having a hard time finding reviews or opinions online. It’s a lot of money to spend even though the brand is credible and renowned. 
 

Obviously there are other contenders, PL, Ayon, Cary, Lab12, Icon, and Chinese brands like Line Magnetic, Willsenton etc. I keep going back to the AR, and maybe it’s because I’m in Minnesota. 
 

Anyone own this amp? Have opinions, positives or criticisms?