Right now, a percentage of my Amazon Prime orders are being delivered via Smartpost. The majority of the smartpost orders have been a slow hassle. Not only are they slower than advertised, but most of the time I have to go to the post office to pick up large boxes. It's an hour out of my day, plus gas, to have to go to the post office and pick up an order. Best case scenario on regular small items, I have to go almost a quarter mile to the community lock-box. With UPS they just bring stuff to my door, or at least to our gate.
This makes the Prime membership much less valuable. However, just for kicks, I ordered something with regular 3-5 day shipping. It took a good 5 days, vs their usual 3 days in the past. So, even the slow shipping has gotten crappier, making Prime still worth it. I can only imagine that's by design.