While other brands of tillers dig dirt, the BCS is a gardening machine. Prepare seedbeds, power compost, and cultivate with precision and ease. The BCS Tiller has unique features that enable you to not just "work" your soil, but to "build" your soil. Also rated for an 8" tilling depth, this model is heavier than the 18" model. With a larger tine circle, the 20" model is more appropriate for power composting.