I am also interested in upgrading to this grinder.
True is that only very recently I upgraded my Mazzer Mini Electronic Type A with SSP burrs. As a home barista only, there is no way for me to do proper evaluation of it in less than 3-6 months. This upgrade is supposed to bring it more to the quality of K30, but I've never owned one, so couldn't tell.
Although I love my Mazzer, I am impressed by Mahlkonig E65S features that can be objectively observed. So I am still playing with idea of upgrading. Taste in cup, being subjective, is completely different story. Not much information I can find in this area - comparisons to K30, PEAK, EK43, other grinders. No scientific observations like particle distribution tests either (which would be great if some people have time to do as there is free software to do them).
Marshall, thank you so far for all the notes on this grinder. It would be great if you keep us updated with your experience, especially as previous K30 owner.