General

You get a cape, medal, and damage skin.

The cape looks awesome, the damage skin looks awesome, the medal has 10 all stats 10 atk for a month.

Probably the most value from any regular game content tbh.

The story line and entire experience are worth while. But that's coming from a player who enjoys playing the game.
You get a medal, a cape, and also the ability to gain skills through the Threads of Fate interface.

i think you get a cape or something, seriously not worth it though. Unless you're into the whole, questing and reading stories, then go for it. The exp aint that great either, making it easier to just grind.