[Sahhaese]

There's a significant difference between "next day" and "2-3 days", and the valuable different is not getting it sooner, it's knowing exactly which day you'll get it.

[quotha]

I was rarely offered next day shipping for free, and often got my items in 3 days instead of the promised 2 days.

[Sahhaese]

Oh, Prime in the UK comes with free next day delivery on everything.

[DanBC]

Except there are plenty of people with prime who want next day but get two to three days because of the piss-poor couriers Amazon chooses to use.

[entropea]

There's also a significant issue with Amazon not actually meeting their SLA's in higher density areas, so "knowing exactly which day you'll get it" often isn't accurate.