Overall, the work was incredible! The trees alone were huge! The retaining wall itself is beautiful, and it was a monster task! They dug down 2-3 feet into Oklahoma clay to lay a foundation of compacted gravel and then a line of bricks beneath the soil (The previous wall was built on top of the ground). The only reason for the subtraction of points is it felt a little rushed at the end and we had to come back to do some additional work ourselves. Our yard has a definite slope away from the terraces. (Where the wall is was more than adequately addressed) While they were building the terraces, I pointed out the slope issues and asked how they were going to ensure erosion didn't eat away the base of the terraces. They built up a base to lay the terraces and then added compressed gravel, but there was probably a 40% slope away from the base. They said it would be fine, as they were going to bring in topsoil to address the slope issue. They did do this somewhat, but the slope was still probably 30-35%. This summer we experienced LOTs of rain, within 2 weeks of the completion of the job, the base was eroded down to the gravel and that was starting to erode as well. My son and I used retaining wall bricks (from Home Depot) to build two small additional terraces around the large terrace to stop erosion. This has been successful, we have had many large rains since then, but have lost no more soil. There was an additional area (around a fruit tree) that I had to do the same thing with at the end of the retaining wall. This might have been a miscommunication though. They installed two drains into the wall to allow for adequate drainage, the base of the wall near two drains was beginning to erode as well after heavy rains. I built two small dry creek beds down from these drains to prevent further erosion. All of this being said, there was no grass or vegetation at the time of the heavy rains to hold the soil in place (as it August and the work had just been finished leaving raw earth in the lower yard). I think we lost a lot of the top soil they brought in through erosion. The presence of grass would have eliminated some of the erosion, but not all. We have since planted grass (tried in August, but it was August in Oklahoma...) and that with the two small terraces we built, there has been no more erosion. Again, All Terrain did a tremendous amount of work in our yard and we are VERY happy with most of it. We just think they ran out of time at the end because it was such a HUGE undertaking.