Thanks to all replies, very interesting. It does seem that this amplifier has staying power.
I heard it again at AXPONA this year driving some Aretai stand mount speakers. Very punchy and clear.
I am probably going to try one. While I love the sound of my Pass XA25 it is not as transparent as it was billed and at times sounds unnaturally warm and polished.
It took over a year for the XA25 to sound like this as it burned in.
Just trying to decide on two or one. Most likely one for starters.