It depends on your demographic. I use Amazon FPS:
- because my customers will probably have an amazon account w/ CC info in it, and will probably not have a paypal account.
- to avoid having to deal with storing CC info on my end.
- to avoid having to buy a HTTPS cert entirely.
That being said, I am not huge on the fact that they leave my site to go pay -- though, I'm hoping users are used to this by now (a la paypal).
