I received my prints from Amazon Photos on Friday. The paper is a bit thin and flimsy, and one of my prints had a small scratch (nearly unnoticeable, to be honest). The two color 5x7s I ordered are OK; the colors are true to the photos as I sent them. Basically, they are hang on the refrigerator with a magnet type prints; not frame and hang on the wall prints. Nothing wrong with that for the price. The black-and-white 8x10 is similarly thin and flimsy, and has just the slightest hint of a pink or purple cast. I only noticed this under fluorescent light in my office and it's not bad enough that a casual observer would notice (I think).
Overall, for three bucks I'm happy. You wouldn't hang them in a museum, but there's nothing wrong with making inexpensive prints to hold in your hands and share with family and friends.