I worked for my money and for my equipment, it didnt fall from the sky into my counter. I also have and use cheaper equipment and i'm not afraid to admit it. But this is not the point here, I react to each individual different, when there is someone I dont like I just go ham.
In my opinion over the years and tests, a finer grind will like less pressure and a more gentle approach. A dual spring lever with 300kf is not a gentle approach, it's like a big hammer hitting the puck, so because of that I do not think this lever will perform the best with those unimodal grinders in it's stock form. But we can test that more pretty soon as me and my friends have 3 units arriving, and we have a varied arsenal of grinders and burrs. I say this because on the decent, each grinder is performing better with a specified profile made for it. A profile that was made for Niche and has great results, is not having good results at all with 98mm ssp HU or 64mm unimodal (multi-purpose/brew). So all my "generalisations" and ideas are based on facts.
Niche is a great grinder already had one, easy to use, no retention, easy to clean. It doesn't even need RDT or much WDT compared to other grinders that you have to babysit if you want consistency. Related to taste I wont comment as we have a different vision of what espresso should taste like.
I already payed and ordered both ims baskets (26 and 32mm height) and I also got this basket of amazon:
https://www.edesiaespress.com/dalla-corte-14g-double-shot-replacement-portafilter-basket-coffee-espresso/
I got it because it has holes at the edge, it's a lower dosage (26mm) and it's a bit conical/tapered and i'm always looking for that.
Have a great week.