Ditto here. I use a Moko/Fintie case for my Mini 4 and a Logitech K380 keyboard. I have the Keys-to-Go but I find that it is pretty hit-or-miss in it registering keystrokes. It's nice to have the K380 because I can switch using it between my 12.9 Pro, Mini 4, and iPhone SE without having to re-pair. (it supports 3 separate devices)