Better than nothing, and chemicals, but not perfect
I think the fertilzer works, and does a good job at promoting growth. However, I've never had weeds and grubs to the extent that I do now and I can see my lawn slowly transforming into an "ugly lawn". However, I will cotinue to subscribe to the service as I have small children and believe the pros of their product outweight the cons. For me, its has not been great, but its better than nothing and better than chemicals.