Chris, there wasn't anything particularly bad about the P51 v '190 book, but it wasn't particularly good either ! I got it out of the local Public Library, to check it over before buying a copy, and I'm glad I did. I thought it was 'averagely' written, with oft seen photos, rather poor profiles, and some inaccuracies. Basically, I wasn't ompressed, considering I have a number of Osprey books which are far superior, both in content and production. The content appeared to be a re-hash of the same old stuff; there are numerous publications covering the subject which are better, although for a novice, it is a handy 'compact' beginners guide I suppose.