So please lock this forum after question is answered ... If you upgrade a spy tower dose the amount of spy def go down or dose it not change at all ..
The real question to ask about towers is what role they play. Sdt was a huge factor in season 1 but are they needed now with the choose your own time to come out of ko? I dont think so personaly. Atd may become the new thing but other than that i dont see much point to them anymore unless your aiming for the dtw mechs of the tower build