The Model TJ604E does a very good job tilling soil. The biggest problem using this tiller is the constant need to extract Bermuda grass and common weeds from steel tines on right and left next to the gear box. Second small peeve is that the electric cord came apart from extension cord frequently. A locking male/female electric connection would be far superior. Duct tape next time to the rescue. My yard soil has not been properly spaded in years, so I expect that future years tilling in yard will be much easier.
This little tiller is amazing. I garden two acres and while I don't expect it to replace my large tiller I am impressed with its power and durability. I use electric tools when a suitable version is available and believe I have found one with this Sun Joe model.