I'm very happy with my Reich, its just replaced one from 2004 that never failed for me, but the handset was playing up, for that model it was around £80 to replace, so being tight I continued with it, just needed a firm finger press.
So with that history, this year I bought another riech and paid extra for the add on board to enable smart phone operation.
My reasoning with buying the App (board) was should I lose the standard handset, or should it fail, then I have the App control on standby.
It requires pairing with the mover and that's it, no data is required. I have an excellent Moto G4 plus phone with a bright screen , which also enables my swift command to show me what going on with everything else.
I should mention my mover is a manual engage, so zero danger of anyone engaging the wheels when powered up, and none when its switch off.