I have used HP Snapfish Calendars, Photo prints and large posters, I would say quality is outstanding.Their website has some quick fix features for photos so you can use it if you don’t use digital retouching (I use Google Picasa and then upload to gain full control over editing). It also has other photo products such as Mugs, key rings etc. which I haven’t use - so my review is limited to the paper based photo products only.
I didn’t need to contact customer care so far. Delivery is fast, Quality is very good and so far I didn’t have any problems whatsoever. Highly recommended.