I am using the ATEM TV Studio but without the audio. I ordered the Behringer SRC-2496 but this is somehow a popular model and wont be available up until September.
My configuration is not using the sound from the ATEM TV Studio and I use a separate 12-input audio mixer instead; which I do have already. The analog audio output is then connected to an audio delay device and then into an Intensity Pro capture card installed on a MacPro. I used the ATEM TV Studio’s HDMI program output as my video source for the Intensity Pro video capture.
The basic configuration on my MacPro only allows NTSC capture so I upgraded my memory to 16GB and that fixed that problem. I can capture in any format now.
My next project would be to purchase the HyperDeck Studio so that I don’t have to drag the heavy MacPro to my location shoot.