Do not fear. I have ordered several things through MAMEMarquees and EVERY piece has been Grade AAA 100% perfect. The only flaw you will find is if you botched the art and there is an error there. I used him for several CPOs and a couple Marquees.
Now that said, if you want to go to the next level, you could order from a company that does translights. the kind you see at like MickyDs menus and movie posters. It has a milk white backing that transmits light and color perfectly. The color is not on paper so you do not see a paper texture under the color. You just see a solid color. I did this for my marquee on my cab. I used MAMEMarquee for my CPO.