I don't know if this has been brought up yet, so I'm posting it here.
Tycho Celchu: "You may perform actions even while you have stress tokens."
Push the Limit: "Once per round, after you perform an action, you may perform 1 free action shown in your action bar. Then receive 1 stress token."
By the rules, a pilot can have any number of stress tokens from any number of sources. Under normal circumstances, stress tokens prevent 2 things: taking actions and performing red manuevers.
So, in theory, Tycho could forego red manuevers in favor of taking 2 actions every turn, piling up a (theoretically) limitless number of stress tokens.
Interesting tidbit: Tycho + Push the Limit = 29 points. Exact same cost as Vader. What's the comparison here between Vader and Tycho in this regard? Tycho has 1 less pilot skill, 1 less hull, (effectively) no pilot upgrade, and has to give up red manuevers for the rest of the game. Also, Tycho gets Boost instead of Barrel Roll (having not yet been able to play with Boost, I can't draw a reasonable comparison between them).
Not to mention the fact that Tycho's second action from Push the Limit has to come from his Action Bar; Vader has no such restriction.
That does seem to illustrate just how good Vader really is for his cost.
Thoughts?