"A disposable mouse with the convenient features of a more expensive one."
The '[Battery Level Visible]' feature is a set of LEDs indicating voltage ranges, not a precise percentage. It's a convenience that offers a rough idea of remaining power at the cost of a constant, small battery drain.
This is a viable option for a travel bag, a secondary computer, or for anyone who considers a mouse a cheap, disposable tool. If you hate buying AA batteries and want side buttons and a battery meter for under $20, the trade-offs might be acceptable.
Anyone seeking a primary mouse for all-day work should invest in something with better components. The low-endurance battery and switches are not built for heavy use. Users needing precision for creative work or gaming will be let down by the basic sensor.