Which.co.uk do a pretty good job at reviewing stuff.
They're not ideal, and they do seem to focus too hard on some things over others.
But in terms of finding "Can I get an X that is half decent for the money I'm willing to spend", they work quite well.
Unfortunately, they are a bit pricey.
I'm a great believer in keeping things as simple and modular as possible.
Much easier to just dump files over FTP than have HA do the saving.
Plus, the camera can operate like a dashcam, and save before/after the event, while that would be tricker in HA, as you'd have to run a buffer.