The only time I've ever had late delivery of Prime, it was caused by severe weather. I didn't call to complain figuring that Amazon still can't control the weather. . I've always been well treated by CS. There was this one time when a package was going all over the country for no reason and Amazon over-nighted a replacement. I ordered Ben-Hur from Amazon UK and after 15 days or so, no disk. They shipped another. 2 days later the first shipment arrived. I emailed them, they said thanks for being honest, and keep the extra disc. My Kindle developed a cracked screen and Amazon replaced it with no questions asked. For me Amazon CS is the gold standard. I'd still rather have tax free as opposed to same-day delivery. I have Prime more for the one-time charge for delivery than for the 2 day delivery part. I've reached the point where I'd rather wait and not go to B&M as long as the price is comparable.