If you are asking me this question, it is due to my live looping workflow.
I control 8 Live loopers with my FCB, as well as some custom M4L patches. All my MIDI is routed to a multiplexer I built using Node to handle the MIDI implementation limitations in Ableton Live. The FCB, plus the MFC for the Axe and the 4 FSU's hanging off of it is a bit of a monstrosity.
It would be nice to consolidate the setup down to a single unit.
with that new information, i highly, HIGHLY recommend the MMGT 22. i have the 16 and i control the Axe, x32 Rack mixer and Infinity Looper all via midi.
my first page of buttons is mostly for the Infinity Looper with 8 or so buttons dedicated to looping functions. i have 4 axe scenes on that page and tuner, and recently i added 2 buttons to control the x32 - vocal reverb and putting my Vocal in and out of the Infinity Looper path, using midi to control both mutes and bus send fader levels. i have 1 system button that changes pages on the mmgt.
the next 2 pages have more buttons for the Axe-Fx, individual effects/blocks, more scenes, etc. there are 16 pages available, or 15 + 1 "local" page unique to each preset. obviously the LCD screens with text, colors, and "reactions" to button presses (change color, go darker, inverse, 1/2 inverse) make it very easy to know what is going on per page.
it's changed the way i control my devices and actually lets me use more on each device. before with the MFC and "only" 17 switches, there was no way to use 8 switches for the external looper pedal, scenes, individual blocks and mixer controls all at the same time. sure i could add 4 additional external switches, but they aren't "smart" and don't turn off or do certain things when changing scenes, presets, etc. just too complicated to use externals (btw, external switches can react to internal logic on the MMGT!).
the computer editor makes things very simple to edit, save, backup, etc. ron, the creator, is active on his forum for questions and has quickly squashed bugs and added new features as requested very frequently.
killer device. it's VERY expensive, almost the price of an axe-fx just for a controller. but well worth it if you are doing what you're doing. someone who just changes presets all night or someone who just plays guitar in a band may not understand, and that's ok. but others do really "need" more control available.