It will eat your brains and test your patience, but overall, it's great.
Once you get out of the newbie dungeon, the fun starts. Most enemy groups can slaughter your party without getting sweaty, and I'm an old fan of role-playing games and have played through BG2 on the hardest difficulty. Imagine my surprise when some plants killed my whole party just like that.
It doesn't get much easier. The quests are long and hard, the journal is probably the worst journal I have seen, and you really have to concentrate on talking if you want to get any side quests.
One thing I have to critisize is the music. I didn't like it even a bit. Ambient isn't bad, but the combat music sucks. When I changed it to fast combat music from Heroes III, it got much better.
Well, you can read the other reviews for a full list of features, I'm a bit lazy to write them all. If anyone is interested in my opinion, this is one hell of an rpg if you're good at playing this sort of games. If not... Don't even think about it.