I received my copy of ADV's 5 Centimeters Per Second yesterday, and watched it this evening.
I've been a Makoto Shinkai fan since his Voices of a Distant Star, and enjoyed (although somewhat less) his The Place Promised in Our Early Days. I've always admired his distinctive drawing style, his breathtaking landscapes, the pacing of his stories, and the underlying musical scores he chooses.
This was no different for 5 Centimeters, although the three-part story makes the plot seem discontinuous compared to his other works. However, I found on reflection that the story really was consistently examining the same theme throughout.
I thought the length of the entire movie appropriate (as I liked the compressed story telling of Voices, but wasn't as happy with the slower unfolding of The Place Promised). The movie kept good emotional tension during the entire piece.
I won't go into plot, except to say it is a good if somewhat melancholy look at relationships as seen through time, nostalgic and bittersweet. Definitely worth a viewing if you get a chance.