I rarely post the same review on different boards, but since I'm still so taken by my first viewing of "Inside" I felt a strong need to add my thoughts to this thread, too:

Oh, boy! This is STRONG stuff! And I say that as somebody who's been collecting horror movies for about two decades now!

Horror has definetely moved to France and it's all for the better, really!
No wonder Hollywood is trying to import all these promising new French genre directors, because they really understand what the word "retro horror" should actually stand for: Not just aping some set-pieces of famed 70's/80's genre titles and getting away with it by a "modern"/fast-paced editing...no, it's the growing sense of unease in the audience that they're in the hands of filmmakers they can't trust NOT to go too far, THAT'S what made the genre movies of our preferred era so special and THAT'S what the French are so good at right now.

Incidently, "Inside" is the best piece of genre filmmaking I've seen since "Haute Tension" and while I started growing a bit uneasy if the hype following the movie's slooooow journey around the globe would live up to my high expectations, rest assured that this is the real deal indeed.
In some ways, "Inside" worked even slightly better for me- on first viewing anyway- because it didn't feel the need to suddenly switch from its straight route to some "clever" surprise revelation.
By now, I've also embraced "Haute Tension's" IMO overly ambitious finale, but I prefer the simpler approach offered in "Inside", which isn't any less gripping and nerve wrecking.
This movie is so gore soaked I might even check out the censored by 2 mins German release to see how it works with a little less of the red stuff, because the mood is so tense and the photography so stylish that I could even watch this with a few less gushes of blood. They'll ban it anyway after a few months- so much's almost for sure...

Being a father certainly increased the scare factor for me, but I'm sure it'll linger in your mind much longer than your usual rental/buy whether you have kids on your own or not.
The latest rumours I caught suggested that "Inside"'s duo of directors MIGHT now be getting involved with the proposed sequel to the Rob Zombie remake of "Halloween" after their initial participation with the "Hellraiser" redux fell flat.
While I hear some already moaming in agony, just witness how close Beatrice Dalle comes to the scariest prowling moments of "The Shape"...and then consider the possibilities...not to forget: The "original" "Halloween 2" was set in a hospital...

This belongs to the best type of genre movies: The ones you rather EXPERIENCE than just watch.
"Inside" is certainly the "Tenebrae" for the new generation!

*****