We haven't tested the Apachie G30 front and rear cam (assuming this is the one you mean) so can't offer too much advice on the quality or reliability of the product - though it does look like a generic camera that's sold under lots of different brand names. What I will say is that if something seems like it's too good to be true, it usually is. And, two cameras, for £35 doesn't sound like most reliable product. There are two main things you need to take into account when buying a dash cam - the footage resolution and whether it will be usable in the case of an accident. I can't seem to find a reliable source of information, not even a website, for the Apachie so I don't know what the footage quality will be like. And, for this price, the footage is unlikely to be good enough for insurers to use in a liability dispute if you have a car accident. If you're set on a low budget cam, I'd get something like the YI Smart (review here: kit.honestjohn.co.uk/reviews/review-yi-smart-dash-.../) - which is £47 and offers very decent footage quality (though it's only front facing). If you want something even cheaper, the Lanka Blue we tested was given 3/5 stars and costs £21: kit.honestjohn.co.uk/reviews/lanka-blue-dash-cam/

Although wiring is a little more complicated, and footage isn't saved onto one SD card, you could always buy two cheaper dash cams and use them as front and rear facing cameras.