It's fluffy, it looks fun and it has a good amount of synergy. The FAQ clears up Vader's ability and Fel's interaction with Yorr.
Anyways, the fantasy behind the list is..
Darth Vader is being flown by Captain Yorr on his private shuttle to see the Emperor. He's being escorted by Baron Soontir Fel. The Emperor wants to assure Vader's safety and sends his own personal escort, Carnor Jax, to rendezvous with them. Spies within the Empire receive word of this and the elite escort soon find themselves ambushed by the Rebels.
How it works from a gameplay perspective:
Yorr's special ability allows you to pull Stress tokens from nearby ships. This works beautifully with Push the Limit on Tie Interceptors because it allows them to pull off ridiculous maneuvers after the push.
Fire-Control System and Weapons Engineer allows you to acquire Target Lock on two different targets, and allows you to re-apply them to two targets (one being the defender) after you fire. The additional Hull Upgrade gives Vader some wiggle room to channel the force through an attack to attack enemy ships' vitals.
Total fire power is a bit lacking, but the fluff and elite feel is second to none. Total power is 9-dice from Range 3, 12 at Range 1 and Vader. The real fun comes from being able to relief stress after PTL on crucial turns to allow the two Tie Aces to do their job more effectively.
Edited by HERO