I have just cancelled my Prime subscription and laughed at all the barriers they put in your way to get you not to complete. If they asked me why I cancelled I would have told them that the Prime delivery service is too late in the day for my convenience.
The other spoof is that they had calculated that I have had 115 deliveries without extra charge, but what they didn't say was that the Prime price is dearer for the same item from non Prime suppliers.
At least Royal mail and Herpes arrive at a reasonable time of day.