I have also had some very positive feedback for the book here, here, here, here and here which is pretty good because they're all written by actual customers. I've also had some encouraging support from Forbidden Planet and Down the Tubes.
I've been pretty quiet about it so far, but the first one hundred copies sold contain a numbered print signed by me featuring the image below. I've wanted it to be a surprise for people who buy the book but, the truth is, I've become slightly embarrassed by rerunning the cover image here every time I have a status update. All of the venues listed above are carrying copies of the book with the insert and my Shop still has a few left if you're quick.