She used it for a couple of hours on Christmas morning and the touchscreen died. No idea why, she didn't abuse it or anything, but it just stopped working. Removing the battery to force a reset had no effect, the DSi was dead.
So I took it back to Toys"R"Us expecting the usual post-purchase run-around that seems so common here (great service before you buy, nothing after). I was very, very impressed. The girl behind the Customer Service counter checked out the DSi and then went and pulled another one from stock. They exchanged it on the spot, the whole process took less than 5 minutes and didn't even involve any filling out of forms or other typical BS.
The only other place in Japan I have experienced such a hassle-free exchange was at Costco.
