Are there any alternatives?

If you’re looking for a mouse with a proper and bulgy ergonomic shape, the only real alternative that comes to mind is the Razer Pro Click. It’s $20 cheaper but doesn’t have RGB or hot-swappable switches, and it’s only available in white. Other ergonomic mice such as Logitech’s G502 Lightspeed or Razer’s Basilisk are too narrow and aggressively sculpted to match the Asus for comfort.

　　

How long will it last?

Normally, I won’t say that a mouse lasts past three to five years, but with replaceable parts, I could see the Gladius III lasting well into a decade. Whether you’ll still be using it then is another question.

　　

Should you buy it?

Absolutely. If your main focus is story-based gaming, and you make long hours at the PC, your right hand will thank you for using one of the most comfortable gaming mice with a palm grip.