Judging by the first tasks and the rewards, current season's Special Sponsor event seems to be a trap.

I had to unlock premium, as I am a huge Borussia Dortmund fan and having the kit and emblem was a target of mine, so combined with the rest of the rewards, I decided to activate premium.

About the event judging by the limited info we have so far:

-the changes in the condition recovery bonuses are a huge minus, nothing to o with a +15% increase for a few remaining days and the 10% earlier on is not there anymore;
-missing the seasonal loan and the academy hot prospect are other huge minus points;
-most mid tier rewards are underwhelming: 15 red packs (I have 2.9k of those), free loan for 5 days, bonuses special coach, the blue exclusive emblem.

Overall, if you are not hunting for the BVB kit and emblem, my suggestion is to stay away from premium unlock this season or buy it only after some of the other tasks are unlocked and you know if it is possible to make progress.