They were great. Our lawn was neglected by the prior homeowners and the clay-like soil was very compact. JUST AERATION was the best value (very high ratings and reviews, relatively low cost) contractor for the job of aerating the lawn, followed by overseeding. I liked that the company focused on this work and wasn't trying to sell an annual service plan. They were highly responsive via Angie's List messages. Best rate through Angie's List. We setup an agreeable date and time and they gave me instructions to mow the lawn and mark buried sprinkler heads, downspouts, and other things that might get damaged. Because the soil was so compact, and the weather had been dry for a while, they instructed me to give the lawn a good soaking the night before, to help the machines penetrate the soil. I did that. A crew of 3 arrived on the scheduled day and immediately got to work. 2 core aerator machines were used, and they made 2 passes over the lawn at a perpendicular (as recommended). As a section of lawn was done, the 3rd crew member spread the grass seed. They used hand tools as needed to work the seeds into patches of bare soil (including a large area by the curb where gas utility lines had just been replaced). They would have also spread fertilizer for another $45, but I already had fertilizer on hand, so did it myself. The soil was definitely still quite hard, even after the soaking, in places, and you could tell where the cores became a little shorter. Prior to the aeration, I'd sent soil tests to the lab and received results. I sent the results to JUST AERATION, during scheduling, for them to review the fertilization needs. They provided appropriate guidance, which was helpful. After the aeration and overseeding, they provided simple and clear guidance on watering and cutting the lawn. The soil and lawn is better since they were here. The grass planted, especially in bare spots, has grown nicely.