Finally found how to edit my review.
Psyren - one of the best shounens.

Story: It has almost no connection to the beginning, but is very strong and interesting. How is the future changed, a little more about parallel worlds, about reality. And a little more common, than what it used to be. However, the timeline is very good, everything falls in place perfectly. And follows the cause-reaction pattern, witch is very rare these days .

Art: Bleach-like, shounenish, bloody brutality! "Oh, no! He breaks out!" is what you think, when the evil mastermind escapes. You can feel the Doom oozing out of every deadly Psy power! And we have a candidate for Shounen Double Page Whore Award here. When the mangaka gains enough exp (by killing n00bs and drawing manga) we will see OP/GANTZ-like pages. 200+ chapters I think.

Characters: Forget what I wrote, there is an entire new development. It is so intense, that every word I write will be a major spoil. The only cliche that is left is "I will protect you/change the future!". The most important thing is that as the power of the characters grow, so do their mental development. They grow more mature/cocky/greedy/etc. And there is no flashback power ups, no hidden reserves of hidden power. Only the character, his brain, guts and ability to fight/survive/adapt.

Enjoyment - good, very good, the best! The manga is not flawless, but it gives a satisfaction comparable to reading Bleach+Naruto at the same time. Even more. There is no manga that I ENJOY more. Just to be on the safe side - I mean enjoy as "happy, optimistic vibe". There is darker types of enjoyment, but they have no place here. It is rare, but you can't hate even "The bad guys".

Similar - well, you know, GANTZ. And I like both of them.
I think that Psyren has something more. Well being shounen limits the pure violence, blood, gore, nudity, sex and etc., but Psyren has the almost unlimited psy-fi fantasy setting. So if the mangaka has a good imagination (it appears that he has) it can be very interesting after the first year. The story is getting more and more twisted. Same goes for the characters.