Sherry E, once you pay, give info, and have your pix taken, you'll be given your AP and the little pamphlet/brochure, and you could run right down the street to the bakery or a store (since you'll have a Premium) or Carnation Cafe and buy something and get your Premium AP discount with it. It's that quick.
Yep. Now, for us, the discounts haven't added up to anything that would be worth it, and when I figure out what we *could have* gotten discounts on it doesn't add up to have made sense for any of us to upgrade to a Premium. For us, it's the tickets where the good deal came in.
It's possible we'll sneak in another trip before our APs expire this year, and if we can we'll try to get an AP7 deal (time's running out on these APs though), and then we would have really gotten good use out of our APs. But just for admission alone we've more than made up for it.
Only for those who absolutely positively will not be coming back within 365 days is an AP not worth it. If by the end of your trip you're thinking about coming back, it makes almost no sense to not upgrade to it (b/c you are probably hooked and you will be coming back, LOL) from whatever ticket you got in with. If you only have that ONE trip, though, Disney has been *very* careful that none of their tickets go over the Deluxe or Premium cost. In the US we can only get a certain number of days on our hoppers, but in other areas people have gotten hoppers that had many more days, and even those hoppers were less than the cost of a Deluxe. So if that is the ONLY trip you'll take, unless you carefully figure out what you'll eat and buy and find that the discounts will take you over the difference, then it's OK (I give permission, LOL) to not buy the AP.