I have spent tens of thousands of dollars on all manner of things at Amazon over the years, and I have never had any problem with anything. I also willingly pay for Amazon Prime shipping each year ($80 for unlimited 2-day shipping; $5 per item for unlimited next day) because the service is just plain wonderful.
In addition to that, if I ever had to return something (for any reason) back it went with no hassle to me (you can even have UPS come and pick it up for a small charge.)
We have Amazon Prime too. It ends up being worth it. Being a little ADD, buying books usually costs me less than the library (don’t ask - Bookman from Seinfeld is still trying to find me).
Thanks.