If you see it on sale grab it. It typically gets steep discounts.
As far as the game itself:
1. It's an Isometric Turn based strategic RPG. So think like Xcom but set in medieval fantasy land.
2. The story is fantastic, you actually start caring about your characters and their story.
3. The combat is deep...there are a massive fuck ton of spells and abilities.
4. There's a difficulty level to suit all skill levels.
5. There's a ton of freedom with what you can do in the game. This freedom does also require creativity to solve puzzles, beat certain boss battles.
6. Because the choices you make in the game are pretty much permanent, it adds replayability to the game to playthrough again not just with different choices, but to have your characters specced in completely different classes. This can result in different people dying or living in the game. For example you may take the Red Prince as a Tank in your first playthrough, but maybe have him as a mage that specializes in pyromancy the second time. There are set characters that are "Canon" for the story, but you can also create a completely new class of character. For example you you could have an undead dwarf rogue type character if you want. Or a Elven Battlemage.
7. It can be played solo or completely online co-op through the campaign and you can delegate what player controls which characters. T
8. There are modifiers that you can use for subsequent playthroughs like faster movement speed to make your second playthrough much faster than the first.
Questions? Ask me anything.