The burrs are the same size, type and material as the K30 (65mm flat steel), but they don't say if the geometery of the burrs is identical to the K30 burrs. Does anyone know?
They should not be the same, as K30 is an espresso only grinder and this one is general purpose?
Mahlkönig has published those particle size charts showing their high-end drip/press grinders plotted against Vario (and demonstrating that Vario is not perfect for drip/press, at least on the particle size distribution side). It would be very interesting to see ProM included in those charts: is it comparable to Vario, or closer to those high-end ones?
I don't think the lack of a display and preset buttons is a big deal.
Display will be available later on. However I agree that in home use there's not much value in that.
Assuming the grind quality is in the league of the K30, and clumping/static aren't a big problem, retention would be an important deciding factor for me. It will be interesting to see if it's as messy as the Baratza Vario.
The grinder is designed to complement K30 as a decaf, press etc. grinder. It should be able to hold it's own when placed next to K30. However it is not aimed to be a primary grinder for a commercial setting, or at least the max. recommended number of 150 double shots in a day would tell you so.
ProM is smaller and therefore should have quite a bit shorter exit chute. It is also slower with identical sized burrs. So there's hope that it would have little retention, no static and no clumping. But we'll see...