Josh Cowen brings a particularly valuable perspective to this book, as someone who did early research on the voucher movement, and was a supporter of the idea. Given subsequent research, he's changed his tune completely, and this book uncovers the massive ideological and economic project underpinning and funding vouchers, charter schools and the like in an effort to undercut America's public schools. He's got real knowledge of the topic, and does a good job highlighting the key turning points in the voucher movement.
My one critique of Cowen is when he strays away from his role of researcher, he can get polemical and rather than trying to mitigate the culture wars, he jumps right into them. There are a few places where a snide comment, or a seemingly tangential critique demonstrates a secondary goal beyond a mere critique of the empty policy goals of the voucher movement.