We have only just started using recorders with AI , we have been using AI cameras for some time now though.
Recorders with AI are fairly new tech, the manufactures say that the recorder is not meant as a replacement for some specific cameras such as ANPR for example, ANPR cameras have not only the technology required they have additional infra red and headlight compensation built into the camera.
The top recorders only have 4 channels that can provide decent AI, the settings that I have been playing with seem to work just fine for intruder detection, but the cameras I am using also have the detection built in (just not switched on in my case)
I am yet to try the recorder AI on a camera that doesnt have AI onboard, I need to try it just for my own benefit, knowing the product better helps me sell it.
While I am working from home now is an ideal time to play around with it, and it is on my list of things to do. Once I have finished sending out all my quotes and updating backup servers for the office that is.