I've always been more concerned about hidden damage: something has been stressed significantly, but has not yet broken. This has ended up coming true on a refu

I've always been more concerned about hidden damage: something has been stressed significantly, but has not yet broken. This has ended up coming true on a refurbished phone I purchased: things seemed to rapidly wear over time. The microphone was imperfect, the reception was oddly poor (I would guess something was not correctly reassembled?), and the actual glass on top of the screen was replaced with something that was not gorilla glass. The adhesive used to re-seal the back was also poor, and quickly came loose. I realize that not every one who purchases a refurbished phone will have these problems, but they are still a risk. And they can happen out side of the warranty period, leaving no recourse. Buying refurbished can be a good option (especially as it can be cheaper for a technical person to just do necessary repairs himself), but buyer beware.