Received yesterday and already calibrated with ARC X (the new calibration software),
Already own a pair of MTM MK II's, previously calibrated with X-Monitor, now also calibrated with ARC X.
Only issue I see with ARC X is that there is no possibility to have 2 sessions (= 2 pairs) selected for monitoring mixes with calibrated monitors. I mean with this if you select one pair of calibrated monitors the other pair is reverted back to initial state (not calibrated) & vice versa.
You can only listen to one pair calibrated (the other not calibrated..),
As ARC X is new I am confident that IK will solve this issue in future updates.
The sound of the Precision 6 MK II is excellent.