Amazing. A consistently engaging and interesting story. It stays captivating in the quieter moments of character interactions in our heroes' daily lives that make up the majority of the game, but through to the enthralling action scenes and all the way up to the climatic finale of the game.

Both Aoko Aozaki and Soujuurou Sizuki are thoroughly explored as the point-of-view characters in the game, with their motivations, backstories, feelings towards other characters, and their view on their place and purpose in the world highlighted in their narration. The other main character, Alice Kuonji, isn't given a POV perspective at all (if I remember correctly), but is characterised just as well through her interactions with Aoko and Soujuurou.
The other side characters are all well-written and service their role in the plot effectively. All I can say is it's a shame there's not another 5 hours of character interactions hidden in the Extras section.

I can't wait for the Tsukihime remake to finally release (40 days left!).