Instruct: Classify Amazon reviews into positive or negative sentiment
Query: What is taking so long?

I will evaluate this item should it ever arrive.When I purchased it on Aug 4 the estimated delivery date was Aug 10. After it failed to arrive I went back to my account to discover the estimated date of delivery was now Aug 17. Today is Aug 14 so I still have to wait until next week for it to arrive and then for the weekend to try it out. Had I known I would have paid the additional cost to receive it in a timely mannerAmazon has never done this to me in any of my other purchases so why this item is taking forever to get here is beyond me. An explanation via e-mail would have been helpful