Indeed the IMX 323 are not as good as the 291, but its not like the 291 deliver desicive more, sure the image are brighter and you can see more at night, but just hit pause and see that the more you can see it is shrouded in motion blur.
But the way the human brain are wired ( to compensate for blur as the human vision are only good in a very little area ) then when viewing live you think, O this is a lot better, and yes it also feel better looking at, but when you then hit pause you see the more you "see" well its not worth much.
BUT ! the IMX 291 might push the twilight zone a bit later in the day, so you stand a larger chance of a plate capture, but its not many lumens the light level have to drop before it have the same challenges as the IMX 323.
IMO the IMX 323 are a just fine rear camera, when there is light its fine, when it is dark you just see the headlights of the car back there, unless you drive in a place with some ambient light.
The DC and the DC PRO as i understand it are the same, aside for the PRO have another firmware to handle the IMX 291 sensor in the rear camera, other than that they are the same and have the same abilities.
The live view on the phone have a 0.5 second delay, and when it is engaged the camera do not start to record automatic so you have to press the REC button in the APP to start recording, after that it will behave normal, and do segments and recycle when the memory card are full, and of course stop recording when you power off ( unsure how it behave if using hard wire kit )
