Actually, I just read that for some reason. My take was that it was way too utopian, didn't give much thought to the endless ways people would try to circumvent it, and in retrospect its forecasts for American crime and global nuclear terrorism were hilariously wrong. (Although I am generally in favor of massively increased honesty and truth machines.) The writing was kind of wooden, but apparently it was Halperin's first novel.

Or maybe "the invention of lying". Probably less philosophical though.