I recently managed to get my hands on some Fly TMC2209 drivers. I can hear you asking though, why am I writing about them, there must be something special right?
I’m not going to go into specifications etc because everyone who comes here will know what a TMC2209 is and what its capable of.
What I really want to point out about these drivers is that, unlike other manufacturers 2209 drivers, when not using sensorless homing, there is no need to remove the diag pin when the motherboard being used has no means to do so. On the underside of the driver, there is a small switch used to enable the diag pin. Other than that bombshell, they are well designed and well made. Definitely recommended.
They can be purchased from the Mellow Store on aliexpress