I had ordered an iphone 6 on Amazon, it has some unique options which you would not find in any other ecommerce site in India. It offers next day delivery option or delivery within 2 days at an added cost of 100 / 50 rupees respectively.
I received the iphone next day, well packed and on time. It allowed me to pay by cash.
One more quality about Amazon is their return policy. Compared to Snapdeal and Flipkart the return policy of Amazon is far more easy and hassle free.
I have ordered products Snapdeal and Flipkart but frankly returning it not as convenient, though Snapdeal is a little better than Flipkart. But Amazon is the best, they will not ask any questions, will send the executive and you can return the product. Payment will be done in your account automatically.
Price wise products on Amazon are a little more expensive compared to Snapdeal but if you care looking for convenience, Amazon is the place.