Super Express: What is it?

I have 2 alts that kinda don’t play with anyone, and another alt that plays with 2 friends, but we only play like 3 times a week together for a few hours. What sort of ‘missions’ will we be asked to do? I kinda need to know what the requirements will be before selecting an appropriate character. It might not make sense to do with the three of us if we can’t make enough progress. Maybe it makes sense to use it on a character that can play more?

It seems to just be some quests to go into chaos dungeons and such with rewards for a character.
Rewards that would make it easier to upgrade gear to get higher ilvl.
For a character that is level 50. If you have below ilvl302 the included gear of ilvl302 is a bonus too.

Other topic seems to have most info about what the quests are: