To be honest? Not great. They vary from book to book, though. I assume you were referring to "The Five Shires"?
The books were originally full-color, but the POD copies are printed in black-and-white (except for the full-color maps in the back, but I'll get to those). The images ended up printing in grayscale, so they look fuzzy and are a little hard to read:
Pages from "The Five Shires."
The original full-color poster map is included in the POD. Well, sort of.
Because of the printer limitations, the original poster-sized fold out map was chopped up into 8.5x11 double-sided panels, and added to the end of the book as an appendix. It's better than nothing, but it's hard to use as intended. Which is unfortunate, because they are otherwise of excellent quality:
The poster-sized full-color map from "The Five Shires." It's no longer poster-sized.
The good news is that the PDF version (which I got for an extra $2 with the purchase of the POD copy) is a full-color scan...so the images in the PDF are full color. And that poster-sized fold out map is still poster-sized in the PDF, so if you have a wide-platen printer (or your local printing service has one), you can print your own posters.
But for fans of fantasy cartography? The POD maps might be a deal-breaker.