Thing is, i never played the Divinity games, so i've got no personal experience of them. While i'll trust the opinions of people here so far, i won't take it on blind faith. If i was inclined to do that, i'd have backed Star Citizen
Another problem with Early Access is you consume the content and by the time of release, you can then be already done with the game. This of course depends on how replayable it is. The BG games i got a few replays out of due to choices you could make and different team compositions. I liked how you could start a single player multiplayer session and build a full team of custom heroes (with the loss of custom dialogue of course, so only worth doing after you have experienced the normal game), so could do some crazy stuff like parties full of rangers or wizards or stuff.
However, i'll keep what people have said in mind, and keep my eye on the game.