I have been buying from flipkart since a long time.
As per my experiences, Flipkart service is really very good. Including return policy, delivery service all are fabulous. I love the tracking system of the orders.
Flipkart is the first thing that comes to mind when it comes to online shopping.
Only complain I have is the pricing thing. Sometimes things shown are overpriced compared to other sites. But it does not bother me much as I buy from the lowest priced sites.