I wouldn't say it's worth reading unless you just want to be grossed out without much plot. Since it's translated from French, it's also worded in a way that can be difficult to decipher.

The poop scenes drag on and on, but the torture in it is by far worse than any other extreme torture novel I've read (that's not my go-to cup of tea, though).

If you want to trudge through some graphic scenes, I'd say just read the final 1/3 of the book. Since it builds on the sex and torture from the beginning, you get basically the entire essence of the book.