I've read a number of books on Reiki, and I happen to like this one very much for a number of reasons. It gets right to the point - with the exception of the symbols, which it does not show out of respect, the books goes into great detail on the hows and whys of attunements, treatments and optional extras such as crystal work, pendulums etc. Compared to may other books, it is also relatively short with summaries, so you can quickly review information later.
As for the illustrations: I don't know why others in their reviews missed this, but the author was *NOT* suggesting people practice Reiki in the buff. The author goes into a lot of wonderfully detailed suggestions as to hand positioning for SPECIFIC health conditions - which is one of the reasons you should pick it up. I also think, as an artist, it was meant to show a spiritual/energetic connection. Still, I think it's a book meant for practitioners only, not to explain to your clients.
Not everything you read here will agree with what you've learned before - every teacher adds their own touch, has their own preferred method. But you may learn a few new things here that you'll take with you!