I don't show a lot of emotion in general and I don't cry very often. This show made my cry, and in the best possible way. It's a joyful, funny, sad, heartbreaking, beautiful show. It's amazing to watch and amazing to listen to. It's not perfect, but that doesn't matter. I loved it from start to finish and it left me sad (not in a bad way) and feeling peaceful. You might not like it, but at least give it a shot. I realize I'm just kinda gushing and not going into specifics. One thing I'd criticize is that some aspects of the story took longer to develop than I would have liked. That's not to say that the story feels padded. The people who made this anime had something to say and they used every episode to say it.
I started watching this yesterday and stayed up until 2:30am. The only reason I stopped was so I'm not a zombie when I hang out today. I woke up this morning and immediately started watching again. I just finished watching the last episode and felt like I had to write something about it. I've never written a review about an anime before. If you're not looking for a story driven show about relationships with others and how they can change your life, maybe steer clear? I'd still say give it a try and see how you like it. I hope you'll get as much out of it as I did. If you don't, that's okay too. Have a great day!