I saw these used on a YouTube woodworking show and decided to try them. If you spray paint from a can by pressing the nozzle down, your hand is gripping the can at the same time your index finger is pressing. For me, my hand tires pretty quickly (word of advice, don’t get old). But the sprayer handle means you don’t grip the can tight, and you’re pulling a trigger, not pressing a button. Hand doesn’t tire. Upshot is these are worth it.