>>2803
I bought one 10 years ago for my first computer build. The fucking thing was about as long as the one in your pic, but still kept detaching every few minutes as I was fiddling around.
I've built three computers since then and haven't used it, and I've never had a problem. Actually, four computers.
I do live in a continental (humid) climate, and I think it's harder to generate static electricity in humid climates. I build my computers while nude and touch something I know is grounded before reaching for new components. Haven't had any problems.
So I'd say non-essential as long as you're reasonably careful and don't shuffle around on a carpeted floor in wool socks while assembling your computer.