I got one of these last Christmas and it's really hard to find vendors that will take them... just to let you know. C: I think I finally got them to use it at World of Disney in Downtown Disney, but I wouldn't count on that anymore either.
That is pretty much the exact opposite of my experience with them in approximately 18 days spent at DLR since mid-September '07.
Every single restaurant, every counter service, every store we bought anything at. The semi-permanent cart to the left of the castle approaching Fantasyland also takes them, thankfully for my need for iced lattes and cookies.
Unfortunately my experience with these was not so positive. My husband had purchased some for our girls and I for our trip a few years back. Every time I used one of the cards it took a painfully long time go thru after they swiped it and then they had to eventually just punch in all the numbers. Not sure what it was or if I did something to alter the cards but I won't use them again and risk wasting precious vacation time. Each CM told me that it sometimes happens.
That happened with 2 of my gift cards. I have MANY. I redeem for disney giftcards on another site, and then I budget with them by either buying a semi-small one each day of my trip, or a bunch of money on one at the beginning of my trip. I think I have about 10-15 separate cards that I've used (you can re-fill them, but I also collect the different cute cards for scrapbooking purposes), and only 2 have been problematic. I just insist that they type the number in, and let them know that typing it in works, and they will be saving time by just going straight to typing it in. One lady had success by pulling a handy dandy small plastic gift bag out, putting the card in it, and running it through with the plastic over it. It's also a trick local-to-me grocery stores were using for awhile when wamu's debit cards were known for having floopy problems with the strips, and it amused me that the Disney CMs knew it too.
Anyway, I have 3 cents left on one of those cards, and the others are empty, so I'm very very glad of that, b/c the others have worked perfectly.
I absolutely LOVE using the giftcards. I do NOT like having umpteen million transactions on my debit card, and I don't like carrying bunches of cash (we have an emergency credit card, and Disney is NOT an emergency).
Plus, anything left over on the disney cards can be used in the future (no expiration), or on disneyshopping.com!
Good to check out disneygiftcard.com, specifically
http://disney.go.com/disneygiftcard/use.html#dl_details for
Disneyland Resort.