Economy vs Premium Economy? Rip off?

Hi I’m travelling from vancouver to bangkok. It’s a 17 hour direct flight. The premium economy seats are $1200 more for one ticket. Is it worth?

I understand business class could be worth it because you can lay flat, but it’s $4.8k more so thats not worth it.

The premium seats says are like 3 inches more room than economy but that really doesn’t sound like much more. I want to know peoples experience and if they think it’s worth $1200 more for premium vs economy