I have been using Round up ultra 3000 for the last 3 years. The problem is you need to understand you have to give it at least 2 to 3 weeks to work. It works by killing the roots, so needs time to penetrate down the weed or grass. There is no instant kill with this product. The first time I used it, I was alarmed that after a week, everything looked the same. In fact, I re-checked the bottle to make sure I hadnt bought feed by accident! After another 3 days, there was a sudden colour change in all the weeds and grass, and within 2 days of that,everything shriveled up and dissapeared. I have a large area of hardcore/stone covered earth, next to a dandy lion filled field, so I get plagued by weeds. Since I starting using Round Up 3000, my applications to keep it totaly weed free have dropped from 4 to 5 to twice a year. When I was using other weed killers, such as weedol etc, you get a lot quicker effect, but nowhere near as long lasting results. The key to this product is patience!