They're good Wayne, although I have spotted a couple of minor errors regarding historic facts. Example - the well known photo of the KG76 Do17, burnt out, after attacking Kenley. The author has it attacking Biggin Hill, with crew bailing out (it belly landed on the outskirts of B.H. airfield), something which has been stated in a number of accounts, even though the complete story is covered, in detail, in a number of books, especially 'The Hardest Day', by Dr.Price.
But, as every crash site is covered, and many of the photos haven't been seen before, and some interesting facts revealed (the I.D. paint change, yellow, to white, to yellow, being a good example), each volume is worth the £25 (£20 direct from the publisher.).
Don't know if I'll get the full set though (currently proposed as ten volumes), although I'll certainly get the rest covering the BoB.