Just FYI: I'm trying the old Equal trick for ants this week. It seems that people are really unsure if it actually works, worsens, or is irrelevant.
So far, I have simply emptied two packets of equal along a very busy ant trail. They were interested, but not frenzied over it.
Oh, and I had used the borax syrup (Terro) for a month until about 3 weeks ago. It definitely reduced the ant population, but no knock out.
I'll keep you all posted!