Ok I made a crap cell phone video and posted it to youtube.
http://www.youtube.com/watch?v=Tr7TBB8TrTU This isn't a tutorial or anything, it's just a quick video to show that these will indeed work with x2a. First I show the x2a build and then I move my hands on the controller and show the fader movement within sonar. Then I go on to perss some buttons, panning, transport...ect...
A couple of quick notes.
I had to start the kontrollers in "CC" mode not mackie.
Once they were found properly by sonar's midi devices I had to assign them as a generic cakewalk controller.
Then you "build" the generic controller controller preferences map. Once you have the map set up for one kontroller, it's pretty easy to assign the second controller to faders 9-16 and the third to 7-24
I'm really hoping I'll get some time in the near future to do some kind of a tutorial on the setup of these units because they are really fun. Until then I'd check out youtube.com for tutorials on using ACT and Sonar's midi "learn" feature. Once I learned some about that, I was able to tinker around and get it working as a generic controller. I used the learn button on the generic cakewalk controller preferences to map volume/panning/etc to faders/buttons 1-8.
Good luck guys, I really feel your pain on this one as I had all of the install issues that everyone else had. I just wish I had more to offer right now as help, because the video really isn't any.