I'm pretty much loyal to Amazon. They've treated me wonderfully, as a customer and as a seller. I have a Kindle Fire, but I'm not using it nearly as much as I expected, especially now that I have a smart phone. I really just love my physical books way too much, I think...Even when I go on vacation, I still end up bringing three books PLUS my Kindle. Even when I buy textbooks that are related to my future career, I prefer to have physical versions for my future library. I wish I used it more often. Maybe when the prices of the books comes down a bit? I can't justify spending $12 on an e-book when I could get a paper and ink version for the same or cheaper.
But I digress! I also buy food and household supplies and tons of other stuff on Amazon and the Prime two-day shipping has definitely paid for itself already!