I am moving to the Euphonix from 24 fader mackie control, using logic as well.
I am still disappointed in the performance of Eucon integration of logic as it is still sluggish at times.
I liked my Mackie system and it was relatively stable, but when the MC Control is out and this system is 100% working there are several advantages that the Artist series does have.
1. You can assign faders, and soon on the MC Control: smart switches. Since mackie is holding on to MIDI, their protocol doesn't allow this unless the improve it in some way.
2. You don't have to re-boot to control another app. When I switched from Logic to PT on my mackie I would have to reboot all three units and press to keys to select either mackie control, logic control, or HUI (for PT). This was a pain in the ass in my opinion. With these units you just switch seamlessly.
3. Layout: I prefer the layout personally to the mackies. I like how you can choose plugins through categories just like in logic pro software.
4. the MC Mix has more options than the mackie extender and I think that is great thinking on the part of euphonix. The MC control is the center unit, but you can access most parameters from the Mix Units which is great when more than one person is working on the controller.
The only CON I have for these units is the slow performance in Logic, and I tend to believe it's Apple's fault because people say it ROCKS with NUENDO/CUBASE