I've had them for DD since 05 and we've even moved house and stuck them back on the walls in the new house - no problems at all. They're great, I love them.
I got mine off ebay but most good baby stores sell the proper brand I am not happy with the cheap ones I got .... but very happy with stickaround brand alos google them you will find heaps of places online sell them
ours have moved house and interstate and there have been no instances of chipped paint...
i have seen the gorgeous 'wallcandy' ones at adairs kids the other day. i got mine from a house nick nack type of store and some also from spotlight and they all work fine!
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