I mentioned these a few weeks ago Paul, in a thread announcing their publication.
Apart from the extracts on their web site, I haven't seen the books, but the RAF versions got good reviews, and the other books I've had from them, such as the Luftwaffe Crash Archive series, and monographs on such things as B-17, B-24, Do-17, and Mosquito units, have been good. Perhaps at first glance a little pricey for the soft-back volumes mentioned, but they're cheaper by pre-order, and there's obviously a lot of work goes into them, so worth the expense I think.