Disclaimer: I have received the AMDRO® PowerFlex® Pest & Weed System for free from BzzAgent, but I am not bias to the product that I received.  I am reviewing this like a regular product I bought. 
    The AMDRO® PowerFlex® Pest & Weed System is a revolutionary weed killing system.  When I received mine from the mail, I was amazed at how simple the product was; just fill the tank with water, insert the cartridge of choice (from the 4 choices), and spray! In my home, the pest products were not needed because I have a subscription to Terminix, a pest-killing company.  If anyone else bought the Amdro sprayer, I would be more than happy to give it to them. I did use the two weed killing cartridges for my walkway and my grass.  Before I received my product, the grass near the much were full of weeds and other unknown plants.  It affected my landscape and I was determined to kill them without harming the grass besides the weeds.  I used the "Lawn Weed Killer" and it eliminated the weeds, although I still had to kick them to the side.  I used the "Grass and Weed Killer" on my walkway and after a few days, it turned the weeds brown and my walkway looked brand new again!  I'm sure the pest killers would do an even better job.  I did try the catridge on a known insect spot under my patio, and I think it did kill a lot of ants that always run around our patio.  Overall, I was quite pleased by this product.
    Sometimes, after you use the sprayer, the weeds might come out next year again.  This always happens with me (especially dandelions).  If your neighbor has a lot of dandelions, offer to spray their yard.  The seeds can transfer to your yard and regrow the problem.  If you want to keep a part of your yard very professional, use mulch.  They block sunlight and prevent weeds from growing.  Also, never leave unwrapped, uneaten food outside. Usually, the ants and other pests will jump on it as soon as you leave.  Anyways, happy weed and pest killing!