I've worked with Klarna on some global ecommerce websites. Their solution does, in fact, yield a much higher conversion rate for mobile shopping.
I'm excited to see how the U.S. adopts such a concept.
I'm always for removing shopping friction. I've always praised Amazon for their 1 button checkout experience, but I think American shoppers will be a little intimidated by this.
It's almost too much too soon.
But we'll see.