Indeed it is very worth watching. Has a kinda of mix between gx 3rd arc (dark and deep) and the mature themes 5d's had.
It is potentially the darkest yugioh series till know. Since the 1st episode they tell you there's a risk you'll die at dueling.
Also worth watching imo for this season:
Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e -> Fuck that was a long name, but I kinda enjoyed the 1st episode. Feels like that kind of school with mistery and and drama that i'd give a try. Plot is about an elite school for japan teens, where they have to proof what if they are worth anything.