It's very much like the Fallouts but with a party similar to Baldur's Gate, with joinable characters all through the game. You start out with a party of four that you create, although you can just select pre-made characters if you want -- makes it easier to get started. You can have up to seven in your party, and that's without an animal companion. Fun character progressions, too, with quite a few skills and abilities. It's turn-based combat, like the Fallouts.
It was on sale on both GOG and Steam last week, so you might still be able to pick it up cheaply.
EDIT: Whoo boy. I just messed up a quest and a bunch of people got massacred. Talk about consequences. After much hand-wringing, I have finally recovered and adventured away elsewhere. Because the ones that died had stuff. And now I have it....
So far, great game. I recommend it.
EDIT: So, my final assessment is that this game started out well but in the end failed to live up to its promise. Not really sure why -- there were some cool aspects to it (I liked the character skill progressions) but the ending fell flat and the game just seemed to run out of steam. A good enough game, lots of fun, but in my opinion not worth a second run.