I'm guilty of being a bit slack here, as I did promise a review of a unit that I bought from China. Just haven't got around to working out what to do with the photos I took, so I've got a few days off to do a bit of work on the new ST, and one of those jobs will be re-attaching the cams and DVR to get it all working. I'll promise that I'll try and get it done over the next week or so.
http://ozstoc.com/index.php?topic=4931.0I think this will probably be the sort of thing you're after.
Just as a preview, it seems to work as stated, but there are a few issues mainly around setup, and the fact that is nothing much you can do with the config of the thing unless you have a screen that you can run video, audioL and audioR to. That may or may not be an issue, but I think with a bit more fiddling, I'll be pretty happy with it. I didn't capture my stack as I think I had the shock sensor setting too high, as big potholes were setting the sensor off and making it copy in protected mode (that's in the event of a crash, it's supposed to go back 15 secs and save the recording in protected area until power is lost or something like that).....I'll leave that for now.