I have had one for a number of years. I ended up using it mainly as a transport feeding a Bryston BDA-1, which resolved a lot of issues. The Class A Bryston output was smoother, warmer and more resolving than the stock analog outputs of the 840.
I then purchased a PWT, which is considerably more expensive than the 840. Feeding both into the Bryston, I found the PWT to be a bit better resolving with a nicer 3d soundfield than the 840, but whether its worth 2.5 to 4x more is a good question. The PWT can play high res files the 840 cannot, which eventually swayed my decision.
But for the money, the 840 is a good product.
I then purchased a PWT, which is considerably more expensive than the 840. Feeding both into the Bryston, I found the PWT to be a bit better resolving with a nicer 3d soundfield than the 840, but whether its worth 2.5 to 4x more is a good question. The PWT can play high res files the 840 cannot, which eventually swayed my decision.
But for the money, the 840 is a good product.