Kor whitening

It seems like Kor has been around for a few years and yet I can hardly find any recent reviews or overwhelmingly positive reviews online. They promote (I know, marketing) such amazing before and after pictures on their website but I can't find any of them anywhere else aside from dentist offices that offer the service.

I'm very, very curious to this system because when I was growing up, I didn't take care of my teeth now the enamel on them has worn away quit a bit, dramatically showing the yellow dentin underneath making me feel quite uncomfortable. It's caused me quite a bit of social anxiety hindering any social progression.

Can anyone here, dentists or patients, truly offer a legitimate vouch for this procedure and attest to the "permanent" and dramatic results they advertise on their website before I spend ~$1000 on temporary happiness?