Just wanted to share the launch of V1.3 of our app Central Control. This latest version supports NewTek 3Play. This will allow you to use a whole variety of controllers with your 3Play (X-Keys, OSC, MIDI etc). Let me know if anyone has any questions!
I'll answer based upon by excellent experiences with Central Control.
1) No Streamdeck software needed. You can use Companion, if you wish, but are not obliged to.
2) Ease of use, multiple devices, as you noted feedback, remote system control, control of TriCaster audio from a physical device, lots of other devices supported, etc, etc, access to its wonderful developer, I could go on and on.
3) Free eval for 30 day. Then a whopping $50. Quoting another user, best money ever spent (and I'll add, not much $ at that).