I have an EOS M and it works ok. I had to install a different version of Magic Lantern to get it to not auto shut off, and generally a lot of poking around in the menus. You can get battery replacement AC adapters quite cheaply and my cheap HDMI->USB works fairly well. Lag is not a problem but it introduces black bars on the left and right and in Google Meet my feed is horizontally squashed. Other video apps the picture is fine though.