I received my first of many Flickr posters in the mail today. The quality of both the images and the paper is excellent. Each of the pitcures is crystal clear and the poster paper is thick and glossy.
One small caveat: some of the photos have to be cropped in order to be inserted in the poster. The ordering page informs you of this and allows you to preview the poster to make sure the photos meet your approval. I didn’t preview mine so a few of my photos (4-5 out of 135) have heads cropped off. Even so, the poster looks very cool, and I highly recommend this service.
I expect to order 4-5 posters a year and at least one photo book a year.