The idea is good but the product fails to deliver to a degree that borders on fraudulent, especially as this is their third attempt. It doesn't look as black as ordinarily black things, more like a dark grey. If you bought an OLED TV and the blacks looked like this, you'd send it back.
As others have said it also attracts dirt in a really terrible way, must be tacky or something because it gets these like white smears, further negating it's supposed "void" properties.
Wish I'd read reviews before wasting money on it, thank God I only used a smidge