if you do a side by side (as I have done) between the original Mythos One fast spin and the Clima Pro slower spin,I found without any reservation at all, using taste as the only indicator, that the faster spin produced a far nicer taste in the cup than the slower spin. Indeed, if ever I go back to a Mythos I would definitely buy the older variant. So, does that translate to other grinders? To keep it simple, as I understand it, the burrs need to spin at a certain speed in order to ‘throw’ the coffee out. On a Mythos because the burrs are set at a 45 degree angle then there is only one way for coffee to exit, but one a true flat position burr, in order to exit you either need to achieve a certain minimum spin. The only conclusion I can draw, and it is probably wrong, is that using a flat with a slow spin, then the coffee is not going to exit as soon as it is ground……but someone may be able to pick fault with what I have said