It took me about 20 hours to really get myself into the story, but I'd say it was worth it. The "mystery" part of the game (route A) was certainly interesting, but not to the point where I loved the game just yet, and route B is a bit slow at times (not to mention a completely different genre).
On the other hand, I really loved routes C and D and the whole "resolution" part of the game. The story is very well crafted, and there is no plot hole. The scenario clearly is the biggest strong point of this VN.

You can tell the writers tried to create likeable and interesting characters, and as a matter of fact, each of them is important to the story and given a good character development. That said, I feel like the emotional connections to them is mild; there were maybe one or two characters that I really liked, and the rest of the cast is good, but not memorable.

The OSTs are good, with a few particularly enjoyable ones.

Overall, it was a very good experience despite some flaws here and there, so I'd recommend it!