Is premium economy worth the extra money?

Depends if you booked it early. My friend booked his US trip 1 year in advance on premium economy at <$1.5K SGD, and you get to earn the full miles as well. You will just have more leg room and space, that's all. But technically speaking, with the full miles you earn, it kinda offsets the $1.5KSGD you paid, which is equivalent to a normal economy class.

I do feel in general, the answer is no.

HOWEVER, you might get good deals on PE sometimes which might make it worth it. I wouldnt mind paying 1.5x for PE

U would only have more leg space, a teeny weeny more width to your seat and an advantage to pre select your food ahead of the economy class... Personal feel that it is not the worth the extra money

For me, i don't think worth the money for premium economy. It is better to go for business rather than premium. Usually extra space i don't find it useful for me as my size is not those ang moh size. So economy is good enough i feel.