Today I had to fight against a lvl85-team on the 12th knot in GW: EP, Vader, Rex, Fives, Clone Sergeant.
I lost with my arena team (Wiggs Lando STH Boba), although my STH had full protection and EP was firstkilled before his first turn.
I changed my team to Barriss instead of Boba, and the fight was easy. She removed the debuffs of one ally every turn, and she was very fast. I think she might be the better toon for removing debuffs than Ackbar.
After the EP event in March we will probably see Sith/Empire teams with Vader more often I guess, so debuffs may be a problem. People in my guild also tell me that in their shard in the top 20, most people have a zeta Barriss. Gear lvl VIII was quite easy to reach. So maybe she is worth to farm.