Both fun and interesting. She's actually a much deeper character than you would first guess, and she has very old fashioned tendencies with a bit of freak thrown in for spice. Yes, I would say it's definitely worth pursuing the romance with Vette, as long as you're at least semi-light side, money oriented, and helpful to people in need without being that much of a ****head. Oh, and trolling Baras and other overtly cruel Sith Lords is fun as hell, AND gains huge affection with Vette.
But to even qualify for her romance arc, I suggest removing her collar ASAP. Otherwise, you get no play from the Galaxy's Cutest Twi'lek. lol