Using the AVID artist mc control v2 since months and can post to have a hugh gain in better and faster operation of Cubase 6 compared to the operation with the mouse or short-cuts.
First there is some work to do to adjust all the touch-commands. But at the end it is really fun to operate just with a touch than to scroll thru dozends of commands with the mouse.
Of course, the price is high (too high?), but I got mine as second hand for about half of the price for a new device.
Had before the CC121, but was not really satisfied, because the EQ-buttons were in wring order (compared with the software) and anyway, the EQ should be placed ahead of the compressor in the insert-chain and this was not possible, if you use the Cubase EQ.
After all, I’m happy to use this controller.