Re: Prime one-day delivery? Ha!
We had it for a year and a bit and ordered dozens (literally) of things. When we ordered before mid-afternoon, I'd say about 3-5 items didn't arrive the next day, and 1 item took longer than two days.
I have also NEVER heard of Amazon ignoring complaints. I've had them phone me back within two minutes of lodging a complaint on their website to sort it out.