Chrissy, I meant to reply to you yesterday and got distracted. We have got the uph pass and stayed and extra night at the beginning and end of our trip and you have to go to the front desk and check out and check back in, you do not have to change rooms, at least we never have.
The php is fine, but if you plan on going to Disney quest and/or pleasure island the uph is a better value. It is sort of a hassle to deal with the ckeckin check out. Now we just arrange our arrival to get there about midday, check in go the parks and when we get back, our room is usually ready. The last day we stay someplace a little cheaper then head out the following morning.
With the uph all I need is one card for our room, parks, meals and every thing else, I lock my wallet and keys in the safe and carry the card, I even swim with in my swim suit. Sometimes that bill that is under door on the last day is a shock, but that just lets me know vacation is over, back to reality. Good luck, just remeber everyone there at wdw is always willing to help.