How does one verify the product you order has the quality you thought it has? How do you know the product was mishandled from the manufacturer to the warehouse to the delivery person to the recipient? These guys are making tons of money selling convenience only. The products are Superfluous to their business model.
The reviews help from verified buyers, I read a lot of those. I also choose brands I know and trust to be the quality I expect. I order all my books from Amazon and they are delivered immediately onto my phone/computer and iPad. My daughter has all of her paper products - toilet paper, paper towels, cleaning supplies- delivered every six months at great convenience to her family.
I have had very few negative experiences with Amazon - my money was refunded immediately when an order (coloring books) never arrived.
All in all, I’ve been ordering from them for more than a decade and haven’t been disappointed with their business model.