I have a Mutec MC-3 + USB and think it is a clear step up to my Breeze (with Talema transformer) with the Yggy. Have not heard PUC or Berkeley so can't provide any comparisons there. The galvanic isolation/reclocking appealed to me in addition to the DDC function. The Breeze gave me a larger soundstage than the stock Yggy but the stock Yggy had tighter, more locked-in imaging. To my ears the Mutec gives me the best of both worlds. I also slightly prefer the Wyred Recovery to the Regen but overall impact of these USB doodads is pretty minimal in my system. I'm generally not a cable person but have to admit that I'm liking the Curious cables (Regen link and full loom USB) over the combo I had before (Paul Pang link with Supra USB). Looking forward to ongoing F1 comparisons.