[fps]

I've used it a few times but only because I know amazon's costs and shipping policies are consistent, and they give you enough information up front on the item page to make a fully informed purchase decision.

Other ecommerce sites frequently have so many additional/hidden charges that I would never want to click "buy" right from the item page. I abandon so many carts when I get to the checkout page because there's $20 in shipping charges on a $8 item, or they've tacked on a $5 handling fee, or they wait until the very end of the process to tell you that the item will ship in 8 weeks.

[beejiu]

Maybe it is different in the US, but in the UK the charges being inconsistent is the reason I do not use One Click. (Amazon UK not being as good seems to be a theme in these comments.)

[djhworld]

I don't think that's the case for Amazon Prime (UK customer)

In my experience the price shown and delivery time estimate is always accurate, and as a Prime customer the delivery fee is included in your subscription