It is quite an epic manga. The first couple chapters might feel a bit slow, but afterward it turns into something really engaging, deep and even shocking. The history offered, while hard to say perfect, is otherwise well researched.
The plot twists are original, and are very fluid with the story. There is quite a bit of detailed gore, yet the gore has impact to it. It isn't just the usual slashy stuff, but intense, with meaning behind it that even heavily affects the characters involved. If blood or violence is happening, the other characters react - it feels quite human. Though sometimes, there are some scenes that might make you loose your lunch if you happen to be eating. I know I have some images that I could do without!
The art style is quite nice. I personally had to briefly get used to it, but I like it since it feels Ancient Greekish. It suits the storyline and theme quite well.
There are some downsides: Eumenes is a very likable character. He is rational, intelligent, calm and empathetic. But I feel like, at times, he gets things too easily. Yes, he does face one brief hardship where he comes from being of high status to a slave, but his stint as a slave is very short - in fact, life gets better quickly, where he becomes a beloved and very succesfuly skilled member of another culture that had immediately adopted him. If he is in trouble but comes out of it, I find sometimes it is based moreso on the help or work of others, not so much getting out of it on his own. Additionally, whatever he puts his hands on as an activity, he does well right away.
And while he can be a passionate person, sometimes he feels a bit emotionless. Nevertheless though, he is a fairly good protagonist, and you will be interested in his journey.
Another downside aspect is the Alexander/Hephaestion. I agree with a previous poster - I'm not exactly fond of this whole split personality thing. It feels.....unrealistic and a bit a bit cheap. I would really much like it better if the author used the actual historical Hephaestion. Even if it a possible romance never became apparent, it would still be interesting to witness the dynamic relationship these two figures had with one another. As Alex's closest friend/confident, it would have been intriguing to see how they both dealt with things like the wars, the arranged marriages, and Alex's "wild" side with the drink.
I'm not sure if it is because thre was uneasyness with having a malexmale plot (Which would be strange I suppose. There is plenty of yaoi mangas out there that are popular and well loved) or if it because there was a worry that Hephaestion would take too much away from Eumenes story and connections with Alexander. I'll probably opt for the latter.
I also wish a little bit more for Olympias. She is a pretty tough lady, who acts like a man. Which is great, but I would opt for more than just seeing her be naked 90% of the time who has sex with men daily then kills them or kicks them out.
In total though, it is a recommended read. It is complex and thourough, very suitable for an audience who wants something real, serious and adult, that also involves plenty of enough complex characters.