Clear and sober, exactly how you want these kinds of books to be written. The section that was most interesting to me was on the causes of ADHD -- I didn't realise we had such a precise understanding of the problem, down to the specific genes that factor in and why -- and also on the medication (I feel a bit reassured about their general safety, now). I also enjoyed the general attitude of cautiousness, and the smacking down of homeopathic treatment ("it's good because it's natural", eyeroll) and various other forms of quackery.