As someone that was in the Beta and has PVPd a ton, I have to say don't get too upset about the eternal soul for purchase. Maybe it's just the character I got, Beelzebub, but he's not good. Kinda like a shaman Eddie with a nomad fury but with vision Eddie damage levels. There's plenty of 4 star characters that are far superior.
I've used Wrath and Eternal Eddie as well, both feel better but again are not super overpowered characters that will break the game. And clairvoyant seems to be a magus version of the GCR but I don't have a trooper with her.
Again, cool idea, mostly cosmetic reward for suffering through the bugs and grind.
Honestly, I'd rather have the 20k coins back to have more flexibility to buy any and all other items in the store each week.