Fair quality at best, probably closer to poor. Two tiles were chipped in one corner. If they were going on the wall it would be very noticeable. Since they are going behind China and glassware in a cabinet, that doesn't make them unusable for me.
All tiles have smudges and marks on them. (Almost looks like someone sneezed or coughed over them) Some can be wiped off, others remain. I am afraid to use a chemical cleaner or spray, it might be harsh on this plastic tile, or whatever it is made of, and make it worse.
I have not secured them with the little sticky pads yet because I'm not sure if they are staying where I put them, so I can not comment on that aspect.