I haven’t followed this thread closely, as I have two Niche Zero’s (one for home and one for the cottage) and like their taste profiles, and the ease of switching between espresso and pour over grind. However you don’t know what you don’t know.
I understand that Forum members ( @DavecUK and @Cuprajake ) have taste tested the Duo (both burrs) and that @tompoland might also have some taste insights. Can you please point me to where in this 350 long post (or elsewhere) comments on the taste profile of the Duo and it’s burrs are made.
FYI, I mostly drink medium (City or City+) decaf, and prefer fuller bodied espresso. I mostly drink espresso, in milk drinks. The Niche and it’s conical Mazzer burr set seems to give me the taste profile I like. By comparison I previously had a Eureka Mignon Specialita which I sold to fund the purchase of the Niche Zero. And I couldn’t dial the Eureka in, to get a taste that I liked, as I had earlier been able to with my prior Bartaza Sette 270.
I am guessing that my taste preferences have led me to conical burrs, but could be wrong. Should I be thinking about the Duo and it’s flat burrs? I cannot afford to own three grinders, as I am saving up for a lever machine. But you don’t know what you don’t know. If the Duo (or another grinder) would result in a further improvement in taste, I might go for it. But it would have to be a substantial improvement.