Ethifi: The Bolder modded SB3 plus PS Ultimate MK II replaces a modded Rotel RCD-1070 with Superclock II, DBE digital output, Rubycon's caps, deadening damping sheets & diodes upgrades.
I have not side by side compare the SB3 to the "best of best" cdps but IMO, its right up there with them sound quality wise ie: the tweaked SB3 plus the PS. The tweaked SB3 plus PS is not cheap but it will cost much less than an equivalent high end CDP.
FYI, before I settled on the SB3 route, I auditioned flagship CDPs from Krell, Meridian & Cary.
I did mention the convenience factor is a SB3 added bonus, right:-)?