Hi Cryophonik,
I have both the Avid Artist Control and Mix. Both worked in a fashion in X1 with limited capabilities.
Pretty much all that was really useful was the sliders and pans, just about everything used in the touch screen on the control I couldn't get to work. Trying to assign knobs and switches to controls just didn't seem to work.
I got X2 when it first come out, back then I tried to get the Artist series to work on it with no luck.
The eucon drivers for X1 don't work on X2, or at least I couldn't get them to work back then.
After spending so much time and money trying to get a decent controller to work in Sonar I finally gave up.
I got PT10 which works fine with the Artist series and use it for mixing.
I love X2, the software itself works better than any other DAW I have tried, I just wish they would get it to work with controllers.
I record and use X2 for virtual instruments, then make separate audio files for each track and load them into PT10 and use the Artist controllers for mixing in there.
I really would love it if cakewalk would get X2 going properly with the Artist series, if we could get full control of things like the pro channel strips it would be the perfect setup.
For now I have lost confidence with Cakewalk and controllers other than their own. Even then it wouldn't surprise me if they had problems.