I've played BG2, it is definitely worth it. I like the sprite graphics, even now. Plus the level of immersion in the game world rivals or exceeds what we have today IMO. Having more than 3 party members at a time and the strategy required make it much more in depth than many of the RPGs currently. It is considered by many to be an all-time classic, and I'd agree.
I'm planning on playing again in the near future...