I find it weird coming to the game's OFFICIAL forum and asking if you should buy the game, but that's me.
The average score for Beyind Divinity on
GameRankings is 78% which means it's a good game. Everything higher than 70% is worth getting, then again...
If you feel you're REALLY into RPGs, I believe it's unquestionable that you should buy the game. If you are unsure, try the demo. If you're alright with the controls and the innovations, go on.