Simplicity & Ruggedness: Fixed magnification means fewer moving parts / less chance of mechanical failures. The build is solid with the mono-tube, sealed & purged internals.
Good for mid-range work: 4× is useful for many close-to-mid distances, hunting, or airgun/.22 LR pest work, especially if you want speed and a wide field of view.
Mil-dot reticle gives hold-overs / hold-unders / ranging ability (if you know how to use mils) which enhances flexibility without needing to dial turrets much.
Large field of view makes target acquisition easier, especially at 4×.
Comfortable eye relief (≈ 90 mm) which helps especially on rifles with recoil, or for shooters who don’t want to press the scope too close.
Light enough and compact enough to mount on many rifles without making them front-heavy.
Are shooting airguns or .22 LR at short-to-mid distances (say up to ~100 yd), where you want speed, simplicity, and quick target acquisition.
Want a lightweight, rugged optic and are okay with no variable power.
Want to use hold-over or mil-based ranging rather than dialing big turret adjustments every shot.
Shoot mostly in daylight or at times with decent light, not so much in deep shadows / low light.