I bought a small garden that has not been cultivated for several decades, and it was infested with brambles, nettles, and other tough weeds. Japanese hoe, when it passed a few centimeters under the ground, cut all the roots of these weeds, allows the extraction of bramble stem, roots nettles, etc., in short radically cleans the floor on thick several centimeters while reducing crumbling and the earth, and for a fraction of the effort that would require other tools (which are planted in the ground vertically, causing unnecessary energy loss, while this tool slides horizontally under the earth).
Faced with the daunting task of clearing waiting for me (I do not want to use power tool), not knowing how to do it, I bought a lot of tools, saying they would come well After weed collectively. I could have simply hoe saw the only Japanese efficiency. Of course, it's work, but it is a deep work which will save a lot of effort then.
Only prerequisite, it seems to me, having a land without too much stones. I do not see how the blade could accommodate repeated shocks on hard surfaces.