I am using flipkart.com form 13/04/2011. I ve been using Flipkart.com for buying Electrical and Electronics Engineering books most of the time. I never had a single problem with it. Once the delivery was delayed by courier, I spoke with customer care they promised to send me a send the same book via other courier, but the courier delivered on tat day and I updated it to the customer care people.
The delivery is very Good. The packing is awesome. I recommend it to all my friends especially for buying books