Buy a cheap flashlight once, it fails when you need it. Buy this, never think about it again.
Why Not Just Buy the Cheap One?
Cheap flashlights from unknown brands or even Maglite use dim LEDs, unreliable switches, and cheap batteries that drain fast. The Fenix PD36R uses a Cree LED, runs on a single 21700 battery, has a tail switch that won't break, and is waterproof to IP68. It's trusted by professionals.
The Buy-Once Math
A $10 flashlight might last a few months before the switch fails or brightness drops. Over 5 years, you'd buy six of them for $60 and still have garbage. The Fenix costs $80 once and will last a decade or more with battery swaps. That's $8/year for a tool that works every time.