How difficult is it, during coding of the FPGA, and especially the filters, to get both DSD and PCM right? Is this a challenge vs creating the best sounding DAC for one or the other? DSD seems more analog (i.e no real samples, just bit to bit differential per se) in its structure so it would seem that they are quite different animals to design for.
As I said in my Qute HD review on CA, I was a DSD-aholic until I heard what the Qute series (now own an EX) does for any PCM, including redbook. It's DSD is very good too (I think EX's DSD is better than HD but maybe just more break-in) but no longer really care that much about formats, as anything you throw at it is quite musical.