There (are) were only four AW worth having at higher levels. BTG was one of them. I cannot see much point in it anymore.
If my BTG on lvl 6 with 112% (of portal production), it means 12% more than without BTG. I just started a new chapter and wonder:
I get 18 pieces of refined steel per a three hour run. 18/112=0.16 (0,16 piece equals 1%).
12x0.16=1,92. Does it mean 2 pieces extra for all the six levels?
Another increase by 0,16 piece (1%) puts me to 13x0,16=2,089, which, I assume, also means 2 pieces.
Will I get, again, 18 pieces after the upgrade??? Can anyone answer that question, because we need to know if it is worth upgrading or not.
If there is no increase in real production, what is the point? That is just a rhetoric question, I can answer that for myself.