I don't understand why people view Apple replacement phones so poorly. I have gotten several via express replacement covered under ApleCare+ and they have all been no less reliable or of less quality than a brand new phone. As a matter of fact, I got my 6s+ replacement in today (came with 9.0!) and it's been fine. The good news is that even if there is a problem with the replacement, your warranty transfers over to the new one so you can just get it replaced again. Doesn't cost me anything.