It's hard to know *what* it's worth without hearing it and we can't even guess at that. There's no specs that I can find published anywhere. It's pretty, but as Grandma always said, "Pretty is as pretty does", so the sound's all that matters, pretty meters aside.
It's perhaps apples and oranges, but adjusting for inflation, it's still double what I paid for an MX-1000U new. And even though I've seen MX-1000U's in fine condition selling for more than I paid new, I'd likely rather buy 3-4 of them than a single integrated (but at the prices I've paid, I could get more like 7, or just do four more MX-1000's and get a pair of CX-1000's to control them.)
Or, alternatively, a pair of A-S2000's.
(I'd probably pay more for an MX-10000, if one could be found, than go for the suggested price on this thing, pretty though it may be.)
The sound quality would *have* to be dramatically better to interest me at that price. And, my gut opinion is that there just isn't that much room for improvement over some of Yamaha's earlier offerings. Not when I can hear the accoustic bass player's fingerprints against the wrapped strings amid a busy big band passage on the old equipment. For that price, I'd expect to hear the saxophone player swallow air between bars.