If you need to dig many holes (e.g. for fencing posts, planting, setting poles) or want to cut down the manual labour drastically — this auger does that much faster than manual digging.
If your work location has uneven or tough soil or you foresee using it many times (e.g. a farm, a construction project, tree-planting) — the powered engine helps compared to using spades or manual tools.
The 4-stroke engine and included bits make it practical, relatively low-maintenance, and versatile — it’s good both for light / medium-duty jobs and for contractors or small businesses that need reliable soil-drilling capacity.