I have about 120 hours on my Marantz 9500 (its been playing 24hrs/day since I got it) and should have an answer for you in 2 weeks when I am closer to 500 hours. I am burning in both the analog and digital outputs and will evaluate both.
At the 100 hour mark the 9500 had a noticeably smoother top end than it did when new but I still hear glare and the midrange is not as fleshed out as I would like (even with a tube dac noted for a full midrange). The speakers don't yet disappear either. It is making progress, though, and I expect to hear better at the 300/500 hour mark.
That said, to be realistic about expectations, I would not hope for the broken-in 9500 to sound world-class, though I do think it will sound smooth and enjoyable. A simple mod like a SuperClock 3 may make a significant impact.
At the 100 hour mark the 9500 had a noticeably smoother top end than it did when new but I still hear glare and the midrange is not as fleshed out as I would like (even with a tube dac noted for a full midrange). The speakers don't yet disappear either. It is making progress, though, and I expect to hear better at the 300/500 hour mark.
That said, to be realistic about expectations, I would not hope for the broken-in 9500 to sound world-class, though I do think it will sound smooth and enjoyable. A simple mod like a SuperClock 3 may make a significant impact.

