I am currently flying with a Steelseries Nimbus controller and it works great and was very easy to set up. Extremely precise control. One thing to note, the controller doesn’t come with a device bracket. However there are lots to choose from on line.
I have not noticed any video lag with the T1d yet (Blue Tooth connection). However, it would be nice if the controller could be used for other applications too. It seems it works only with the Tello App, or?