When I read what these 4 applications were designed to do it was a no brainier to give it a try. Steps 1-4 provide the feeding and weed control at the appropriate time of the year for best results. Scott's has always been the #1 product that I like to use, so this system made perfect sense. I applied Step 1 a couple weeks ago and the patches of crab grass already look sick. I may spray them in another month but so far Scott's may have already killed 90%+ of what I see. I'm confident the remaining Steps will be just as effective. I have enough left over I'll be able to use it next year -- 2 years worth for my 3000 sq ft yard.