Arthursmuck,
Definately. ARC CD-7 was already an improvement over the MBL 1531, and Puccini is even better. Another player worth considering with the digital in is Accuphase DP-700 - it is smoother, not as detailed, but overall it is a very good CDP.
Microstrip,
I already had Puccini in my system for a week or so, now I'm gonna have it again, this time with the U-Clock.
Compared to the ARC, Puccini has much better resolution, more air and better HF extension, the harmonic structere of music is better presented, image specify is better (CD-7 is a bit out of focus in comparision), bass is better defined, miscrodynamics and transcient speed are much improved and overall - it just sounds more like live music.
I personally hated the previous dCS offerings - the 8Pi integrated was the worst of them and absolute disaster, sounding very bright and mechanical, but Puccini is a real gem.