From many conversations, and my personal experience, the reliability of prime for two day deliveries has gone way down. It's generally a day or two before the item even ships in my region. Amazon is also failing to handle rampant knock-offs mixed in with legitimate products. It seems pretty brazen to increase the cost of Prime in light of those issues, even if it is only the monthly subscription. I'm sure it won't ac…
+1 on more late Prime deliveries than there used to be. FWIW, you can request a free month of Prime anytime you get a Prime order late (up to 12 times per subscription renewal, from what I've read). I've done it a few times already; once you find the customer service page, it's pretty painless.
EDIT: Just want to make it clear that this isn't my isolated experience -- http://www.cbs46.com/story/36856477/mail-carriers-usps-warns...