Although I had plenty of questions about the time travel part this was a mind blowing Inception type movie, it kept you thinking well after the movie was over. During the movie, I kept wondering if time travel was possible why didn't they do this or that. When I finally got over trying to figure it out I enjoyed the ride. Levitt did great job of portraying Willis' younger self, down to familiar ways of speaking and facial expressions. It did get a little slow toward the end, but wrapped things up pretty well. Great movie!