This is an identical saw to the JS-1 at half the length. For uber precise and critical cuts, this is your saw of choice. Because the stroke is shorter, it allows you more control. This saw is highly recommended for the cuts above and for those making smaller scale work such as boxes, containers, and thin stock.
Japanese Saws cut on the pull stroke, and because the blades are under tension during cutting, the blade thickness can be much thinner than European heritage saws. A thinner blade means less material is removed and requires much less effort to use. With a little practice, your cuts will look like they were made with a laser.
In soft woods, Japanese Saws cut so efficiently, it is hard to believe it is made by hand. In hard woods, as in all hand sawing operations, let the saw progress at its pace and apply very little downward pressure. Cuts are started at the back of your stock as you pull forward. Aggressive and impatient users will invariably break teeth on these saws which defeats the purpose of owning a precision saw.