Jackie — Yes, unreservedly. It is superb. And it's written in proper, grammatical, correctly spelled and punctuated British English, so it's not only useful but also a pleasure to read, unlike many modern books on British glass. Unfortunately it's too heavy to read in the bath, where I'm currently reading The Guernsey Literary and Potato Peel Pie Society.
I haven't yet found any errors, which is remarkable and most unusual. I thought I'd found one a few days ago, but a colleague explained that the author had finished that particular chapter about four years ago, when it wasn't an error but a future update. However it would be useful for such a large book for Charles to date chapters or sections in some way, as the book's future value lies in it providing a fixed reference point at one or several known moments in time, to which we can add updates as new information emerges.
Two examples of how it has proved useful:
I bought an unsigned piece of glass at an antiques centre about two weeks ago that I identified from a photograph in the book. The margin on that one purchase will pay for the book.Two days ago I looked up Sigmund Pollitzer (1930s designer) on the web. All I found was a wall plaque in the V&A with a few brief notes. There are pages on him in Charles' book!
I hope that helps.
Bernard C. 8)