Anyone been able to upgrade to new Logic version and check for incompatibility with Komplete/Kontakt/Battery/Reaktor, etc.?
Also it seems Logic has got rid of MFX entirely as now standard AU's are MIDI aware
https://community.native-instruments.com/discussion/18366/guitar-rig-6-mfx-patches-gone-when-updating-to-logic-10-8#latest
Might be an idea to wait - there is a note doubling bug with KK3 we have just discovered.
I've also just found a bug in Logic itself, if you try and deselect a MIDI input the inputs themselves double. It's possible that is connected to the above issue.