I have the same battery back cover ($18 ebay) + Black Griffin reveal with a clear back ($10 ebay or $30 others)
It looks super sexy. You just have to fix something in between the camera and the flash, and you are good to go.
I don't have any problems with the camera and it's quality. Flash works as it supposed to.
I don't see any problems why not change your back cover if you want to.
I already order a white back cover for my girlfriend and also a white griffin reveal. I think I will look good.
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I could care less if it was real or not. It is so easy to remove the back for us to add our own personal touch to them. I expect the iPhone to be like that next year. Change the back and call it an iPhone 5! I have a case which covers the back anyway and makes the cosmetic change become moot for me. No need to get jealous or insecure about anything if it were true.