Just received DEVO 12S....

Problems first:
For unknown reason, real time clock resets every power cycle.
Few glitches while playing with mainpage config toggle icons which need reboot to fix.
Touch screen trolled me after Deviation upgrade without calibration
That's all

So far so good
I can just copy models folder from DEVO 10.
**DANGER! DEVO 12(S) has its own HOLD switch not RUDD D/R. Make sure to assign new hold switch after copying models from different Tx.
Screen is readable in sunlight! (Tested in Bangkok-sun at 3PM)
Completely agree, will never go back to buttons interface
Switches and knobs feel much better than DEVO10 (sticks feel similar however)
Better than DEVO F12E (not considering FPV capability) IMO

Almost opened the whole Tx to find that battery

Turned out to be just under the main battery (Yes, Battery under Battery)
Found a CR1220 Li cell with 0.18V remaining