Just finished it last night on the Kindle (fast read, maybe an hour total over two days?) It was perfect in almost every way, but:
* I'd of course want to have seen more Cenobite time. That first chapter was like Woah. Also it's clear that Pinhead was supposed to be Cenobite #2 (female!).
* I'd have loved to know more about Frank's travels in his obsession to find the box.
* I would have rewritten the part where the engineer says "I AM THE ENGINEER". Like, duh, but why would you just say that. It reminds me of Team America's "MATT DAMON!!!". Instead, maybe a voice or instinct came to Kirstie so that she Knew that This Was The Engineer. Minor gripe, but made me go "lol, really?" in the middle of the most serious part.
A great book about horrible people, that also happens to feature hell and demons. 'd like it, it's the best parts of good zombie fiction minus the fighting over resources.
It's one of the few horror novels to actually squick me way out, which might've been part of the draw (big maybe, there's one scene that made me honestly wonder about Mr. Barker's issues with women) if the rest wasn't so tacky.