It's not horrible, the prose was actually well written and kept me wanting to read more, but...

I just wasn't very impressed with it. The whole Hy-Bractor, the poppers, and "caveman" parts of the story just felt pretty cheap and childish. Which isn't necessarily a bad thing, but compared to the other NSA novels I've read this seems to be the worst.

And the whole surgery and removing Rose's head part was breaking my suspension  of disbelief, even for Doctor Who Standards.