Finally watched Primer 7.5/10
The film definitely lives up to its name. I got lost understanding how the time travel works and got even more lost when the "failsafe" was introduced. My mind is still fucked even after reading all the theories and explanations, albeit there is a cool graphic that does a pretty good job explaining how the time travel works. This is probably the most complex film I have ever watched and this is the type of film where multiple viewings are encouraged to get the full experience.