The control XT Pro allows you to add extra channel controls to your existing MCU Pro, and if you are anything like me you will definitely want to do that! I love having hands on control of all my equipment and the MCU gives a more analogue feel to your DAW - unfortunately it only has 8 channels. I got 2 of these Control XT Pros - and I'm glad I did as I can now control 24 channels in my DAW - and I can still add one more allowing me 32 channel control!
The build on these units, like the MCU Pro, is fantastic, super strong and sturdy!