Amazon are excellent for returns and refunds, one of the best company's I have ever dealt with for this.
Buy from Amazon itself not sellers using Amazon to sell through.
You can get some great bargains at much lower prices on Amazon, but as on any site occasionally you can get the items cheaper elsewhere.
Free super saver delivery is great if you are not in a rush. My super saver items always come in good time as long as they are in stock so no problems there.
Occasionally the items take longer as they are not in stock, when you go to order just keep an eye on the time scales it gives you for delivery, it a good indication of how long you will wait. Need it faster? Go to the high street and buy it.
4 stars not 5 as I have had occasion were I have waited 5 weeks for a dvd ( around Xmas time when they are very busy). But when i emailed complaining it suddenly arrived a few days later...
Amazon customer services are good, so maybe the odd nudge to them is worth while;-)
All in all I love Amazon... one of my first choices for buying online!