Highly recommend them, but, do not link to your Disney band, what will happen is that you will not be able to use the card during the trip. I used to work for Travelex, but, for the life of me cannot remember exactly why not, but, the card company will not allow payments while it is linked to a hotel reservation, any hotel not just Disney, it's the same if you use it with regards to hiring anything, it is only useful for purchases for which it is ideal, I used mine the last two trips with no problems whatsoever, you will get charged if you use it in a ATM, but, only the local ATM charge that everyone gets stuffed for, even locals, but, you won't get the Non Sterling Transfer charge (hooray!)
When you check in put another card on, but, make sure you pay it off at the end of the trip using the Pre paid card, the night before you go is probably best then don't charge anything after that.
If you can, go for a company that allows you two cards on your account, put one in the safe and the other one with you, so if you lose the original card you cancel it, but, as the second card has a different 16 digit number you cancel the first one and will still be able to use the one in the safe, but, make sure you cancel the first one. Make sure you know the pins for both cards, I admit mine are the same on both of them, but, very few shops do chip and pin.
The cards are either Mastercard or Visa and are accepted anywhere that takes these cards, always keep a tally of what you have and remember that when you unload them you will get the companies buy back rate as if you were changing back cash, so make sure you only put on what you need and top us as you go along, which you should be able to do online or ever the phone. Don't forget to take cash as well.
Added note. The launderette at FQ now only accepts cards to use the washers and dryers, if you used a debit or credit card you would be paying just as much in charges, the PP Cards are ideal for these too, I went nuts when I went to FQ last November to find this, I should have complained to Disney, I still may do so, Pop on my visit in May still took cash.
Oh yes, you can use them to purchase stuff on the internet from the US, I ordered stuff from the US
Disney Store that couldn't be shipped to the UK and got free shipping using the PPC and I used it for Garden Grocer with no problem. Added bonus