A few little nylon frays on the BN model. All 3 I have had had a little bit somewhere. But I wanted 64GB, had Moto note the defects on my account, and they told me to just chat back if I wanted to swap in the future (and having documented pictures shows it wasn't abuse on my part).
So I am not worried about it at all.
Oh, one also had a gap (flashing from when the back case was made bulged the volume rocker out). But not my first one or the one I currently have.