Who has had experience with this stuff. I just picked up some of the Prosecuter swift action. I tried it on some weeds in the side walk at my house and the next day in less than 24 hours they were dieing. What i want to know will it stay gone or will they come back. I have been using it to spray fence lines and trying it on brush piles. I just want to get some feed back from some pros using this weed killer in the field.