I have nothing but praise for Amazon. They are efficient and easy to shop with. On the couple of occasions where I've had a problem or needed to return an item they couldn't have been more helpful - their returns system is simple, straightforward and works well. I subscribe to Amazon Prime as a regular shopper, it's well worth paying for, particularly since other members of your household can get free delivery under the one subscription.
Amazon are a modern company who've got it right and set a good example for the standard required of online shopping.