Coherence is set up thusly: Strange things begin to happen when a group of friends gather for a dinner party on an evening when a comet is passing overhead.
My spoiler free review:
The short: I'm a science based kind of person, there is no doubt. So I know that when a comet passes close to the Earth, no matter how many people I'm having dinner with, and no matter how close the comet gets to Earth, I'll be fine. Nonetheless, I rolled with quite a lot of this storyline.
I loved the ingenuity of the dinner party guests, and I love the icon box that they build to see what's what (nothing more to say there to avoid spoilers).
The longer: Although I really loved the glow sticks and the general tenacity of the guests, I was disappointed that the storyline ended up taking a smaller, goofier path to it's end. It became a tiny story about a tiny person, instead of a story about the whole world at large and everyone's stake in the universe. And the science kind of stank, as you'd imagine.
Still, a mystery about a multiverse is probably worth a gander if you like that kind of thing. See Primer first, for sure. And skip Upstream Color for sure. This one is a good middle ground in that scheme.
I didn't see a lot of coherence in Coherence.