I have MC4, the dual burr but the Mazzer is the main burr sets.
It does the job, never regret buying, and no intent to change to MC5/6 as I love Mazzer taste profile for darker/medium coffee.
Conical, so easy to use, trivial to dial, silent. Premium Niche, better built and with obvious benefit of the pre-braker.
If money is not an issue, go for it. Very good grinder.