Just saw this post. In this post
viewtopic.php?f=12&t=7510805&p=433431#p433431, I had been trying to find a mapping solution to fix the problem where the MCU Pro did not show ticks in the time display.
Well, jam-s suggested to look at the Mixer Jaexx MCU enhanced map. I did, and I have been using this map, and am completely thrilled with it. It just makes more sense. Not only that, but Props support provided a mapping solution to fix the ticks. I modified the map and it worked fine. Then I shared it with Mixer Jaexx, and he added it into the enhanced map too. I don't have the XT extender, but if I did, I would use the MJ extender map too. I have not seen that MJ has a remote map for the discontinued C4.
So, in my understanding, the MJ enhanced map for the X-Touch, or MCU is for the main unit, and it works for me. There is a separate map for the extender. I'd like to have an extender. I think one thing is that the extra displays can provide more information when using an extender, showing more parameters from the SSL channels.
I'm not sure which is better, the X-Touch, or Mackie MCU. It's clear to me that MJ prefers the X-Touch -- I have not used it. It would certainly be a bit easier on the wallet than the Mackie. I have no complaints about the Mackie MCU. It is solid. So I'm not sure...if I was buying now, I think the X-Touch, might be something to try (and use the MJ maps).