Made great ROI on it this year. In May it was blowing us with several leads a day. Pretty quiet now in mid season. Set a MAX amount you will spend and bid. If it works do more, if not forget it. Think about all other marketing. Do you spend money and not get jobs? Same thing. I questioned it at first but then got a few jobs and a few weekly customers. It seems to cater to younger professionals who don't have time for lawn care.