We just bought AP's this last November and so far have not found a single downside. Upside - free parking, we have timeshares in Orlando so we stay off-site. Discount on the DDE card (20% discount on food/beverages - including alcoholic beverages in certain restaurants); AP offers 10% discount at certain restaurants, also discounts on merchandise at certain shops.
Just booked a room for one night at POFQ using AP room discount.
If you are going more than 10 days, or more than one trip, then IMHO, the AP is the way to go. We went in November for 6 days, going this coming Jan. for 6 days, back again in Feb. for 7 days, then back again in early November for another 7 days. Plus, when it's time to renew, we'll get a discount for renewing!