Tempered Glass Cases?

What's your guy's opinion on glass computer cases? Like tempered glass side panels, or even the mirrored one on the front?

I personally don't see a need for them. I'm someone who cares more about performance than looks since my computer hides under my desk. But I can see the appeal to them.

It's not a bad addition to the market if you would ask me. If you are going to build a pc, why not make it look good as well? Tempered glass works really well with RGB.

I think they look pretty cool, myself.