I used Everything must go, and wasn't terribley impressed. I'm sticking with my round up, or scythe.
And you definitely need a better way to buy your glyphosate. Right now a 2.5 gallon jug of Prosecutor, 41% glyphosate plus stickers, is $100 at Lesco. At 2 oz per gallon, that's 60 cents to treat 1000'.