I just installed the device but from the first installation and use it is reasonable for the price. The documents that came with the unit are instructions in poor translation style, but if you're good enough with the radio installation you can figure it out. The only issue I have is a couple of wires as the wording in the brochure is awful and there is no description, the important wires speak for themselves but the ones I find awful are A1, A2 and A3 which I found out with a bit of digging. and reasonably guessing that the A1 is the one used to 'trigger' the rear camera, with the device working well but if your budget allows you to pick up a well-known brand.
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