I have order several items from MameMarquees in the past, and have been usually satisfied and happy with what I've received.
However, I should mention that the printed item is only as good as the file they have to work with. One of the items they sell is a Circus Charlie CPO. I had found an art file online, but was unhappy with the way it was made because some of the small detail was blurred together or missing - almost like someone just scanned it in but didn't use enough of a DPI resolution. Well, the CPO I got from MameMarquee's was made off of that file, and those small details are blurred or missing - just like in the file.
So - as long as their file is good, the item you'll get is good.
You should also be aware that it will NOT be a screened-on-plexi marquee like the original. it will be printed in a translite style that you either sandwich or affix to plexi or glass...