Amazon Prime may be good for you, because you like to get things ASAP, and with free shipping.
I do not use Amazon prime, because I do not like the idea of paying for shipping, when many items already are listed with free shipping.
I am rarely in a hurry for a particular item.
I find that many items I buy, are cheaper on E-Bay, and also have free shipping.
I have no axe to grind with Amazon, and they certainly are good at what they do.
I do buy from Amazon when they have the best pricing.
Amazon also charges me sales tax, while many E-Bay sellers do not. That alone is a 7% saving for me.
I just do not want to pay extra for shipping, when it offers me very little (quick) benefit.
I also note that MANY items sold on Amazon are NOT ELIGIBLE for prime.
I am an old guy,..... so I certainly do live at a slower pace than some folks.
The more money I save...the more STUFF I can buy!