This Bluetooth module is needed if you’d like to edit your Boss devices (Katana, GX-100, etc) from an iPad/phone without crouching over. I’ve a bad back so don’t like editing parameters crouched over or on the floor and this device makes life easier. It pairs well and is easily installed, I’ve had no issues. Takes a few moments to connect in Boss’ Tone Studio app but after that it’s seamless whilst editing the patch. If you switch to a different patch it’ll take a few moments again to load. I think it’s worth it for convenience’s sake.