YES!!
Definitely get this game, and the expansion too.
I prefer it in some ways to BGII:
It sets the scene for BGII, the beginning of the story
There are more NPCs (although less NPC interaction - no romances)
You get to see your character develop from a lvl 1 weakling!
There are more areas to explore, lots of open countryside with monsters and quests
The story is more engaging
Plenty of dungeons (esp. with TOTSC installed)
More difficult (IMHO) - monsters on a map respawn every time you reload to discourage reloading constantly
The only real disadvantage is that you cannot play it at higher resolution with drop away toolbars, but this is not a real problem, just eyecandy!
There are also no kits (apart from specialist mages), so you have to pick straight fighter/thief/ranger/paladin/bard/druid/cleric/mage
But definitely get this game! Go NOW! Buy it, buy it, buy it...
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Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas