Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sloooow Shipping

I bought a couple of these headphones so that the kids could each have their own pair while we were vacationing. When I placed the order, I had over 2 weeks before we left, so I used the Free Shipping option. Three days before we were to leave, Amazon had not even shipped the headphones even though they were in stock, and refused to cancel the order, with some lame excuse about their shipping methods.The headphones were delivered when we were halfway through vacation.I know this is a shakedown from Amazon to induce me to switch to their "Prime" membership which I will never do on principle. Since then, I have not bought a single item that is sold by Amazon, using their marketplace instead, and have had no shipping issues.The headphones work well enough for what they are worth, but if you want them delivered on time, do not buy them from Amazon.