Not so hot
I used this company for a year. Their customer service was really nice and always responsive but my results were mixed. I kept getting weeds throughout the year. Each time I called, they would send someone out to spot treat, but I kept getting weeds between each treatment.
They never let me know when it was time to seed and aerate. When I asked customer service they said I had to explictly request these services. With a lawn care service I expect to be notified when it is time to seed/aerate to keep a healthy lawn.
The straw that broke the camel's back was my yard got spots of grubs. Simply Green only noticed this on the third visit.
They are a bit more affordable than other services, but I wasn't happy with their work.