How is Borderlands 2 Online for PC?

Have it on Xbox, beat it and max level'd Zer0 but I'm kind of interested in getting it on PC with four other classes to try. $30 for the next 4 hours, I can't tell if it's an actual interest and desire to play, or panic that it'll cost 50% more if I change my mind later.

The DLC is another $30, but since there's no deal on it, that can be purchased any time if I feel the need.

Just curious how active/fun/friendly an average multiplayer lobby is on PC.