As in "Symbol" Matsumoto leaves you philosophically baffled after having finished the movie, and not in a David-Lynch-weird-just-for-the-sake kind of way. "R100" will stay with me for a long time challenging me to decode what the message really is. No matter what answer I will come up with it is rare to find these kind of movies, that offers the diametrical opposite of Hollywood movies that gives even the most ignorant person answers to all his questions.
I could give you a number of reasons why you should watch this movie, but if you, like me, is one of those people who doesn't necessarily need a linear plot in order to enjoy a movie, but rather evaluates quality by the directors capacity to surprise you, you will already want to see this movie - and you should.