I had and tested many grinders. I owned Niche, Mazzer Kony E, Ceado e37, Ditting old (803?), Ek43s (with various parts and aligned, ofc with ssp HU), mahlkonig guatemala SB the big one with ssp aligned and changed carrier, some smaller diy grinders with 64mm mahlkonig Kenya/proM burrs, g-iota and bentwood.
I also did test at my house several times Lagom with unimodal burrs and Ultra/Levercraft grinder with 98mm HU.
Out of all, the Bentwood wins, brews or espresso, best overall grinder. Best clean brews, easy to use, write micron number on bag you are ready to go. I do daily V60 in the morning for my wife, and then 2 espresso for me in the day, I switch from V60 (400-600 microns) to espresso (80-120 microns) each day, no retention.
What makes the bentwood so good? the dual grind system, it has a big long thick pre-breaker auger, that pre-breaks the beans and feeds them at the same rate to the 63mm no holes custom burrs. Everything inside the grinder is enlarged and oversized, the burrs are double the thickness of normal burrs for stability, the burr chamber is over 3 cm in material, stainless, everything is oversized, sturdy and heavy (25kg~). Monster of a grinder with best overall results.
I can pull 100% Robusta with balanced sweet thick coating mouthfeel, with no bitterness. I could never do that on ssp.
I can also pull light roasts and the Bentwood pushes the floral notes more than ssp.
Have a look on what's inside. Thick! just like Vesuvius Leva