My Espresso coffee grinders review 2023

Just my own interpretation

Extract from coffee ad astra

There is no single best

It depends on your espresso style: normal blended or single origin (SOE)

Key characteristics of different espresso 

Blended: balanced

SOE: unimodal, each of tastes stand out loudly.

most people preferred characteristic along the NorthEast-SouthWest zone

For blended, Sweet spot is middle of chart 

For SOE, swett spot is NE or SW, along NE-SW zone

IMHO:

blended: 14. G-Iota Probarista, Niche zero

SOE: Baratza forte

4. mahlkonig X54. , 1 Rocket Faustino and 3 Quarmar M80 offers special characters 

Does burr size and geometry matter?

Just one of the factors.

For blended: flat burr, 50 to 70mm is "good enough"

For SOE: flat burr, burr size is not only factor.

From Jonathan Gagne:

top-rated grinders appear to be somewhat balanced in this particular figure rather than being located at one extreme. It is still hard to say this is super conclusive (we would need many more such studies for this), but one thing this figure teaches us probably with some robustness is that unimodality and uniformity were apparently not the only factors at play. 

Notice how the G-Iota Probarista grinder, which was rated quite badly in the blind tasting, falls pretty close to the Baratza Forté and the Niche Zero which both came out near the top of the blind tasting cores. 

This hints that probably something else, perhaps even not visible in a PSD, such as clumping or heating of the grounds, affected the taste in a negative way with the G-Iota Probarista grinder.

The score is not only about taste but

Material/value

Volume /loudness

Deadspace (Totraum)

Grind Speed

Temperature

Grams by Bean container 

Consistency(fluctuation) in output

Usability

Grind size replicability

Single dose performance 

Reference:

Kaffeemacher

2024 sub rmb 2000 Chinese grinders lineup