I just got a Tdac and all I can say is that you owe it to yourself to try it. It is that good. I had a Benchmark and sold it for the original TADAC.
The Benchmark is very detailed and accurate, but is a little dry and sterile. The TADAC is all that the Benchmark is, but adds life to the music.I recently tried the TDAC and it is like a high definition version of the original TADAC. It is more detailed and has a better soundstage. The dynamics have improved as well. Everything sounds more real.
I am very happy with this purchase.