This manga is, like I said, absolutely wonderful.
I discovered it at a scanlations site by chance, and I think that was the best thing I've ever done ;
I didn't know what to read, so I simply looked at the different propositions and I saw Natsume Yuujinchou. You must know that I'm hardly interested in a manga until someone recommend it, and I'm really difficult on the design of the main character. But this one, enven tough the drawing wasn't my favorite back then, attracted me somehow, and I tought "Why not?". At first, it was 1, then 2, then 3, then 4... Then, it passed from 10 to 20, and before I knew it, I had already finished it, crying and all. I was so happy to know it wasn't finished! But we must wait one more month before the next chapter is released, and I really couldn't wait until then. So I read it again, and again, etc... And it didn't bored me, even the third time.
Just one thing I regret, I told you that the design of Natsume was really important, of course, and I fell in love with him, of course, but I didn't find this same beautiful Natsume in the anime... Because of that, I don't have the courage of watching it... Plus, I tried the voices, and I was really disappointed. Not that the seiyuu are horrible, but they don't resemble the image of "my natsume and nyanko sensei"... I don't know if you understand what I mean, but when I read the manga first, I can't stand to look at the anime...
Well, I told you my experience and not really my opinion of this manga, because all of it is already said in the previous comments, so I won't say more. It was just to make you understand that this manga is really magic, and I recommend it to everyone in this world, even the ones who never tried any manga. Really.