DPD chappie just delivered my Magni 3 and after a bit of a panic (I accidentally switched sources on the Mimby) all is running well.
The Mimby & Magni 3 pairing is vastly superior to the Modi (1) and Magni 2 duo I was running before. The Mimby adds a lot more space around individual instruments, making them far easier to pick out; it also creates a bigger and more 3D sound stage, cleans up and strengthens the bass and smooths the highs while increasing the detail retrieval quite significantly. The difference between the Magni 2 and 3 is more subtle but the sound stage is wider and the sound quality is smoother and cleaner, making the strengths of the Mimby even more apparent.
The only negative I have is that the source button fits too tightly in the hole on the Mimby, so if I apply pressure to the top of the unit it changes sources - solution: don't apply pressure to the top of the unit.
Now to let it burn in for 500 hours (j/k)
ps. On initial listening the Magni 3 sounded very harsh in the high mids to highs - this was due to the unit being extremely cold when it was delivered. As it warmed up it got smoother and smoother.