I had a pathetic experience with Printo at Electronic City, Bangalore. Although the store seems to be full most times, probably because of the small size, the quality they provide is way below sub-standard.
My original pictures were bright and full of color which the shop attendant diluted before firing the prints. On questioning he said this will ensure proper prints based on their settings. Trusting his judgement I let him print the pictures but to my dismay they all turned out bland and colourless. Only go to them if you want to later shred the prints!