I recently received a HP Sprocket for Christmas which was ordered from Amazon. After charging and connecting my unit, I printed my first two photos today. I am very disappointed by the photo quality. The colors are not true to the original image (much more dull and less vibrant) and the quality appears very grainy. I have seen other forum posts with complaints of blue tinted photos with grainy quality as well.
After doing some research via the online forum and other peoples' previous concerns, I confirmed that I am using authentic printing paper (used the pack that came with my unit), the unit is fully charged, and I performed a firmware update to version 1.1.5 before making my first print.
Ultimately, I'm not sure if this is due to an issue with the printer itself or printer paper or if these results produced are expected (grainyness and poor colors). Again, I am very disappointed by the photo quality.