The event surprise boxes could be nice in all honesty. I liked the St. Patrick's Day Event. Most likely extra currency. Upgrades for the next event's buildings seems too powerful...
I don't mind this event's main building. It isn't great, but not horrible either. The decos though... they are pretty underwhelming. The attack and defense boosts are too small compared to other buildings. You could get 2 level 2 SOs that would give the same defense boost in 1/5 the space.
I see myself getting and placing the main building, but avoiding the decos and instead getting SOs or another Treasury.