Well, I guess I get the ball rolling.
Play till heroic now and the quest is doable with a normal squad. Though the valiant heroic are harder, but still manage to complete without much problem. So event heroes in my opinion is not a must have. But yet to try legendary. Those they clear, please share your opinions.
The quests are very similar to the story quests, in terms of difficulty.
Rewards wise, first normal is about 5 crystal, 2nd tier is 7 crystal, 3rd tier is 14 crystal. 4th tier unknown.
Bazaar, very interesting things but nothing to "fight" over for. Meaning to me, once I manage to complete 100%, I will just farm the crystal to exchange for the tickets. Hoping for a good 5*.
Event quests, there is a part that need you to do story quests, so those that saying the event will slow you down, now there is a reason to do it, though I will cap together with the daily quest and the job quests are also considered.
Enjoy this event!!! I personally like it as it slow this down to allow u to build the team, not forgetting they drop 2* fodder.