I ordered around 12-15 books from flipkart alone and their delivery is fantastic. My recent experience with them is Actually my friend is preparing for Bank P.O Examination and he searched in many book shops for one book named "Quantitative aptitude for competitive examinations by abhijit guha" and I said him to order in flipkart-he was little fear to order in online(he said it will deliver late etc), i said I will order in flipkart and you will get with in 2 days, he partially agreed and I ordered yesterday and still he was saying that it will deliver late.
But the surprise part is that it delivered within 15 hours. I ordered yesterday 12:00PM yesterday and my friend got the book in his hand 10 am today:-). He was shocked and he appreciated flipkart for speedy delivery:-)
So thought of conveying this experience so that all can know about flipkart delivery:-) Attached my order copy too:-)