Have you ever had a player with their own hidden agenda, like supporting the empire/rebellion/black sun? How did that work out between them and the players? Did they get revealed? Did the players go bananas and try to stop the insider? How did you handle the obligation rolls when they came up without giving too much away?

49 minutes ago, Lukey84 said:

Have you ever had a player with their own hidden agenda,

Yes; though to be clear, their agenda never ran counter to the immediate goals of the group; they just had occasional side missions that they had to squeeze in in addition to the main job.

51 minutes ago, Lukey84 said:

How did that work out between them and the players? Did they get revealed?

The players knew about it and were totally cool with it. Their characters never learned the truth (the player ended up relocated to Texas to work on the Forces of Corruption expansion for Empire at War).

53 minutes ago, Lukey84 said:

Did the players go bananas and try to stop the insider?

No, my players are really good about not metagaming unless they're doing it to their character's detriment (usually for humor's sake).

54 minutes ago, Lukey84 said:

How did you handle the obligation rolls when they came up without giving too much away?

I don't use obligation.

Yes . . .

I figured out what that back stabbing dark force tainted jerk was up to before the 'big reveal' but I stayed in character; "Oh my GEORGE! Did that back stabbing dark force tainted jerk REALLY just DO that?!?!? Oh my!"

The players are mostly okay . . . I think. We're all adults (for the most part). There may be some bad blood still, but we talked through the situation.

Yes . . . our characters tried to stop the "outsider." When she open fired on the ship we were on. If we ever come across that character ever again, she's dead. We'll probably also put out a bounty on her head sooner or later.

The obligation rules are used in kind of a ham-fisted manner by that GM. But the rules as written (RAW) are kind of ham-fisted anyway. I recommend dealing with obligation in a more intuitive manner, with a GM studying the pc's obligations and figuring out complications to the plot that will enhance the story and drive the narrative forward, even if those interruptions taint the overall direction of the narrative. A bit of a taint can add color and depth for the players In my honest opinion (IMHO?).

I played a character like this in Legend of the Five Rings and it was awesome. The other players knew about it, and even though I was often actively thwarting the actions of their characters they role-played to a T and did not meta. One of the other PCs and my character even fell in love while I was having to secretly thwart their actions as ordered by their daimyo. If your players can role-play without bleed, and can maintain in character knowledge as it should be then it can be great. If they aren't up for that and resent an internal problem then it may not work.