I have had a problem with German Roaches since we moved into our home. I have tried Max Force because when I have used it in the past it has worked great! Although it doesn't seem to work as well on German Roaches. I then tried the Invict and seemed to have really good results, and maybe because it came with the Gentrol disc. Then I tried Vendetta. I thought I had hit the jackpot, and it did kill some, but I have gotten the best results out of Invict.