Im not so sure about full compatibility with all cameras.
I have a Canon 5D4 and 80D. using the mention TC (canon fit obviously) i get strange exposure results with my Canon 70-300L. None of my other lenses produces this issue. The Exposure meter reads dead centre but the actual exposure can be anything up to 2 EV brighter. Its very random. If i take full control of the camera its fine, but i have to ignore the metering display.
I also have a 650D and had a 5D3 and both were spot on with the same lens/TC.