There were some challenges with the existing grades. The old wall was "flush" with neighbors retaining walls on both sides. So the lower new wall needed to match those. Also the grade of the sidewalk where the lower wall is, is sloped, while the grade of the yard where the upper wall is, is more level. The final upper wall overshot the grade of the lawn in one corner (i.e. stuck up above the grade of the lawn). In the contractor's defense even though it looked wrong to me I approved the line before they installed. Otherwise everything went really well. I had a few haggles with the site superintendent about what was included in the bid, but it was all resolved to my satisfaction. It was a bit pricey, but I really wanted the two tiered wall rather than slope to a lower wall because of a 100' fir tree in the front yard (limit soil erosion). Also, they subbed out the concrete for the stairs and walkway so that added to the cost. I have had many complements on the wall, even from folks just walking by. Very happy with the end product.