I have recently received the Exemplar 5910 which is still too new to be assessed, although the first night was a revelation. Apart from the possibility that the 5910 will change this, I have not heard any digital that beats the Reimyo CDP777, although I have never bought one as I want to play sacds. I had both the Exemplar 2900 in its many mods as well as the Exemplar 3910 in its several versions, with many of them caused by the development of the 5910. I have preferred these to my old EMM and dCS gear, but those comparisons were made before there were changes in both. I have only heard the APL in several shows and not in a side by side comparison in any good circumstance. I have heard the DV-50, UX-1, and the mono dac unit whose name I don't recall. The DV-50 was easily bested by the Exemplar 2900 and the APL/Philips sacd100. I didn't like the UX-1 without the atomic clock and with it it was too expensive. Same for the mono dacs. I do not think any of the above would be a downward step from the Krell cd player, which I consider second rate.
I agree with dvavc in that you should listen to these in your system if possible.
I agree with dvavc in that you should listen to these in your system if possible.