Hmm I haven't watched the trailer, my brother recommended it.

I like that it keeps you guessing what is going on and it is not exhausting or confusing. Like there is a lot of thought put into it. Its a very good psychological thriller in my opinion. It is well crafted, and the production value is on par with any blockbuster movie. Definitely better than any movie out right now, sadly. If psychological thriller is your thing I recommend it.