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Personally I'd be wary of getting a chinese eBay deck for warranty reasons and I wouldn't trust the quality of a non branded deck. As for the lack of CD, who uses them anyway? I know I don't.
I am willing to take the chance, the OS is unmolested android so you know it's solid, and the hardware is basically off the shelf tablet parts, so it's pretty hard to do wrong. They offer a decent enough warranty according to their site. They also have videos on youtube showing benchmarks and performance seems on par with most tablets. That said there is always the chance it just doesn't turn on one day which would be annoying, but can happen with almost anything these days.
Still deciding if i should just buy one or not, but will update if I do. Never installed a head unit before but shouldn't be too hard.
Might have to get some new speakers too, so should look into that also.