Just a quick comment to say I agree with almost everything here. This was the very first Yuri I read. I have it on my Wishlist on Amazon right now, will be ordering it as soon as I am able.
I can completely understand those who feel it's "too long" or something like that. Unlike Sasameki Koto (which I also love btw.) this doesn't feel dragged out. Everything is there for a reason. Just keep in mind that both girls are extremely dense when it comes to anything relationship wise. Especially Mari :)
Get it, enjoy it. Show the publishers that WE WANT YURI :)