I have purchased many products from Flipkart. I choose this website because many of my friends had already purchased products from Flipkart successfully. The best part of Flipkart is their product delivery speed, that is amazingly fast, and their return policy within 30 days(especially for mobile phones). My experience with Flipkart till now is decent.
My advice: It is best when you are going to buy product worth Rs.500 plus.