Amazon is a market leader in the online shopping industry. With the introduction of its Prime Service it has done a remarkable job as it guarantees the timely delivery of the products.
I would give it 5 stars in terms of Customer Service based on my personal experience and would recommend this to my friends and relatives.
No complains till now with regards to products purchase from Amazon.
Website is very fluent but one suggestion, please improve the App available in Android platforms as sometimes it saysProduct not found, try again later message.