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To be fair, the grind retention was the main selling point of the Sette for me. I haven't seen any direct comparisons between the two, just the consensus that they're both top tier for home grinders in that regard.
For some reason I thought the Niche had much less of a problem with popcorning when single-dosing, but after actually having a look, it looks like the Sette is actually better in that regard.
I think what I've found is that despite thinking of myself as being relatively ambivalent regarding aesthetics, it is the nicer design of the Niche that appeals to me.
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I've been really impressed just unboxing it. It looks and feels like a premium product, which I guess it should for it's price tag.
I'd read about the popcorning problems on earlier versions, I think they reduced it in later models by adding in a small perspex plate into the feed hole. Can be bought and installed separately for early machines but is included on later builds, including mine.
Not sure how it compares with the Sette with this countermeasure but like you say, they're both top tier.
Likewise, my equipment is likely beyond my interest/pallette/taste for coffee but I just find the retention in the grinder I have so frustrating while making small adjustments