We used them last year and our lawn didn't improve much. The weed problem was just as bad at the end of the summer as the beginning. The lawn thickened a bit but You can achieve the same results on your own with some seed and fertilizer. This year our lawn is the worst on the block as if nothing took root last year, very disappointing. Also, be warned you will be on the hook for next year as well ....it is in the fine print that if you do not call to cancel they will come every year. Although their sales person never told us that. Before they show up they have an automated service call you if it catches your machine and you don't check your messages they take this as someone picked up and confirmed it was okay for them to come and service your lawn. They claim they also send mail notifications which we never received. They apparently don't need your verbal confirmation to show up at the beginning of the season and treat your lawn. We are being forced to pay 50$ for a service we didn't request or want as the results last year where so disappointing.