Purely cosmetic.
Light Armor Only.
Very small amount of customization kits.
A pet droid thingy.
Final destination.
No, not worth it.
The Malgus made it worth it.
The CE vendor is fairly underwhelming, mostly because it has one armor set - and it's light so it's basically useless for a ton of people. And on the Republic Side there were only customization kits for Corso and T7