The Duet's uses the same converters as the multi-channel Ensemble, but the verdict on gearslutz.com seems to be that the Mini-Dac still has the slightly better d/a section. Some, however, claim that the Ensemble's d/a is just under the Rosetta.
I'm still trying to decide between the Pico and Duet for portable laptop headphone listening, but the Mac-only aspect somehow speaks for the Duet. "Sorry, you can't connect that to your laptop. It's Mac-only."
