I have been using the QconPro for a few years.
For any MCU protocol type controllers including Qcon, here are my biggest concerns:
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Is Icon even continuing with the QconPro or will the Icon Pro X replace it? I would avoid the Pro X for a while. It’s new and the extenders won’t even be available for a while. Honestly, I would avoid any Version 1 of a controller.
With that said, my Qcon Pro is working very well. If you are comparing the Qcon Pro to the Mackie MCU and Behringer X-touch, IMO a lot comes down to personal tastes. Size, build, and warranty are important. Keep in mind since they are all MCU, the functions will be very similar.
Good luck!