Author here... AMA.

I recently read almost the whole book in a week or so. It's excellent and I feel like I can write in D pretty well after reading it. Too bad that I most likely won't be writing in D, but, at least, I'm confident I can come back to it anytime and be up to speed if I ever need to. This book should be the goto for anyone who wishes to quickly learn the language.

Planning on an update? Some new features made it into the language (I think).