Decent watch, could watch again, but can't really recommend.
I'll openly admit that they way I remember this movie is the lovely Amanda Alch has a(n unnecessary) striptease scene, so take that as you will: it might only be suitable for a Bad Movie Night.
This really is "Breakfast Club" as a survival horror.
The idea that the library is cursed and trying to kill them is interesting on its own, mixed with a conspiracy cover up is good, but there is a third element that almost pushes it too far. That they're all uber rich snots actually takes it too far for me, now that I think of it.
The cast is actually pretty good, but the lines and writing are so extra ridiculous that the movie is definitely hard to take seriously at points.
Ultimately the movie is a lot of chaotic fun with a last man standing vibe (spoiled by the introductory scene) even before it becomes apparent, intro aside.
It's a dumb movie, but it's a fun movie, whether or not you're turning your brain off for the night.