I've just bought it for use with my kids as they love science & history. What I have read about it and seen on the online preview made it look interesting and accessible to children although I often find reading Dawkins a bit like being shouted at. I was about to buy it as a present for another similar child but then noticed on the online preview that it had a chapter on the "God Delusion". I'm happy for my kids to read this kind of stuff but bailed out to give it to another as I think mostly people are very sensitive about this kind of stuff. Am I just being overly delicate?
I've bought it for DD - I've read the first couple of chapters and am finding it very accessible, interesting and enjoyable.
It is very clear from the outset what Dawkins views on religion are - so if you are not 100% sure about the beliefs of the family you are planning to give it to, I'd suggest leaving it. So far, the chapters I have read have lumped religious belief in with belief in Pixies, magicians and dodgy pyschics - so lots of potential for offence.