Useless building! Even level 10 upgrade is only +5% ground defense! Go go go tap monkeys!
only temp boosts i found of any value was the +1 building upgrade and +5 energy regen and maybe if they put out a -25% upgrade time or cost.
All others seems like a bait and switch.
ah the + 1 building upgrade was indeed useful. I used to run 1 for LTB upgrade, 1 for continuous IPH increase and then the temp + 1 for increasing boost buildings. Now, I'll have to just mix things up I guess. Even with my fairly modest IPH it is largely worthless increasing it ad all I get is more money I have no use for...
no boost + no temp boost = no gold for gree.....