New Audio Research Reference 150 SE

It also took 3 + weeks from shipping to return.
I'm at 123 hours and the sound seems pretty stable.
What I am noticing is that the system is noticeably more revealing, pulling out a bit more detail, deeper and more realistic staging from even poorer recordings. The system is just so delightful with which to listen to music.

Ok ... my amp has racked up 100+ hours. My impressions are very positive. The music sounds liquid and open. The amp's ability to drive my speakers is effortless, particularly at loud dynamic transients.

Imaging and sound stage are great.

All in all .. much better sounding than before.

Good luck, continued good listening.

mine is in MN for the upgrade and the repair i mentioned. will revert my experiences in a month+ once i get it broken in, as kal mentioned several coupling caps were changed in the upgrade and cap formation takes time...

Nirvana is reached at the 200 to 300 hour mark.