DD, about to turn 6, could not have coped with any of them at the start of the year, when she wouldn't even look at a cartoon skeleton and would bust in to tears if one of us stood on an ant. But about 2 months ago she had suddenly moved past all that and we're now half way through the Half Blood Prince (the 6th one - we're all sharing the reading of them, which helps with explaining bits she's uncertain about). We've started each one on the premise that we'd stop if she was uncomfortable, but she's like a girl possessed. Can't get enough of them. We've watched the first 4 movies together, but she decided after watching the 4th one yesterday she preferred the books (yay - me too!)

But I do think that for this age there should be some supervision of it and an opportunity to ask questions - reading them together has been great for that and I'd have no qualms with her reading them to herself once we're done, but this first time through it just gives me peace of mind.