Definitely a very slow paced anime, if you are looking for action you are at the wrong place.
However, if you are interested in experiencing the elevating joys, the wide arsenal of emotions and artistic features an anime can offer then you have just found what you are looking for.
This piece of art is coming at you with a mixture of sounds, pictures, and dialog like not much other anime out there. Every single episode is a rather complex assessment of the different systems that have existed and exist throughout human history and of the different element of human personality in general.
Our main hero, Kino is a traveler and as such it is not the end point, not the destiny of the journey that is important for her, but the experience she gather while being on the road. Many of the episodes have not much connections to each other, they could be separated from each other and still be meaningful, in other words there are a lots of episodes (in the literature sense).
It was created by the same crew as Serial Experiments Lain, so if you've seen that you should have a good idea what you are in for, however this one is taking a less theoretic approach to the different problems humanity as a whole and an individual is facing. Most importantly, each episode gives you a comprehensive example, that way getting the problem close to you and is looking for practical solutions. Still in the end the Kino takes no active part in the events and is just a bystander, who forms her opinion but does nothing more (maybe with exemption of 1-2 life-death problems she can't stand by).
Summing up, to truly understand this piece you have to do your own part, this show doesn't serve you answers on a silver plate, but rather questions.