I have Daka, Talia, Asajji and NS initiate at 7* g8 and NS acolyte 5* (near six) g8 and I can say that they are very flexible, you can use em in GW but also in DS battle with allies' Phasma (everyone has got her). They are quite good and I like them also because they are a really team. I know that with this team you'll never reach first place in Arena and Raid, but with one team you can manage a lot of things.
I know it's me, but I don't really like the usual arena team that 90% of people have. The devs should give more power to sinergy teams like this one. I think arena would be better and funnier than now!!
The only big problem is Asajji's AI. It sucks!! But I think one day they'll fix it, maybe when they will add another NS toon (hope so...)