Unfortunately, I cannot report as one who as read it. That said, it's on my reading list (similar to my mead list in that it's long and gets added to more quickly than things get checked off it) based on some good recommendations from multiple beekeepers and entomologists.
Seeley, the author, is to bees what EO Wilson is to ants; pretty much THE GUY when it comes to bee research (as I understand it, at least).