UC is a great book, but it was too long and too expensive in hardback only and so never reached as far as it could have. Only the already converted members of the 2nd amd "choir' would spring for the $25. Beyond "our" crowd, I doubt it was read much at all.
Also my plot has lots of good guy LEOs who hate the Special Training Unit type outfits as much as we do, and the plot will not "turn off" the undecideds the way that UC may have. There's lots of action but no hog feeding in my book.
If you keep the "genital gymnastics" level to a minimum, I could see homeschool dads like me making it required reading for the kids