I have ordered from Amazon since its inception, usually on a monthly basis. Knock on wood but, to date, I've never had a complaint. At first, I only shopped for books, now I check with them first for anything I order. I am amazed that their prices are usually as good as, or better than, the competition. I even have a link to their site on my blog. I was really excited when I published my first poetry book, at the age of 65 - which is available on Amazon!
Products I order arrive quickly, even from member suppliers. I' have never had to return anything. Amazon is my number one source for reasonably priced audiobooks. I can't drive a block without one playing!