Well this is my first review so take everything i say with a grain of salt.
Anyways i read this manga in my local library ages ago when i wasn't in to anime and i thought with my 14 year old brain that is was truly a masterpiece . Now that i have read many other manga that were really the definition of a masterpiece ( Berserk , Vagabond...)
i have to say that is as good as an average Shonen can get. I really liked the story in the beginning tho i felt like it got really complicated and all over the place really quick. The characters and their development were on point mostly in psyren were they spend mostly of the time fighting. The art is really good and i for myself liked it a lot . As for the enjoinment i have to say it was a great experience and right on my filed of manga that i enjoy ( Shonen with fights and a good story with a satisfying ending )now if you red this and want something similar i would recommend Beelzebub they did a colab on one page with psyren and i thought to myself that they indeed resemble each other tho beelzebub is way longer and not that complicated ( which i prefer ).
Yeah thats all for now