I have used a Trivista 21 in my system for some 4 years now. I initially used a Esoteric P700 transport which has been upgraded with replacement Trichord Research digital output board plus replacement master clock with power supply. This combination is surprisingly good and has been compared with friends quite favourably to a Krell MD1 transport; with the modded Esoteric mainly lacking in the bottom end against the Krell's traditional area of strength.
Then later, I got a Modwright Sony 999ES, and found that the Sony 999 to be, as TVAD noted, surprisingly good in that it clearly outperformed the Esoteric, especially in the bass area where the latter was weak. Its was a long time ago but from memory, I would say the 999 is at least the equal of, if not better than the Krell MD1, working into the Trivista.
And with respect to Stanwal's comment, my experience indicate that Anthony Michaelson's comment that the transport does not matter, to be more salemen's chat than an accurate statement. It does.
Lastly, the Trivista 21 really is a very good DAC. When I got the Modwright, I fully expected to be able to sell the Trivista, based on most opinions from Audiogon on this point. Well, surprise, I found that I could not bring myself to sell it; it has its own set of strengths that made me kept both in my system in the end. The latter comprises Aesthetix Calypso pre-amp; Krell FPB300c power driving Von Schweikert VR4jr speakers. System works off a Hydra 8, and cables are predominantky VH Audio with Black Sand Silver Ref. & Pure Note Paragon power cables.
Hope this helps.