From what little I played so far, I feel this is a must for any fan of Final Fantasy Tactics or similar games.
The positioning is even more important than in FF Tactics, and the tutorials are pleasantly concise.

There is however a LOT of dialog. I personally find it entertaining, but I know that's not everyone's cup of tea and I feel this should be pointed out.
The english voices are alright. Not great, not terrible, just alright.

theres a lot of complaints about dialogue but i dont mind it. its more of a visual novel than it is a tactical rpg and im enjoying it a lot
the voice acting is also good, in jp at least, i havent heard it in english but some people say its bad
my only complaint is that the keyboard and mouse controls are ♥♥♥♥♥♥♥ awful, so use a controller

This isn't a game, it's an interactive book. 100% play/read it.