I have visited at 6.15 pm & i guess thats the best...

I have visited at 6.15 pm & i guess thats the best time to go to see sunset and the sun reflection in the steel wall.
Better to check weather forecast to avoid rainy weather. because photos dont come good at that time.
To be honest, with 20$ nothing is extraordinary to see from the observation deck or 86 floor. Its better to visit kl tower instead,because from there one can take photo with twin tower. But from twin tower I found nothing amazing.
Twin tower visiting is 41 floor,86 floor and 83 floor. 41 floor is skybridge and 83 is observation deck and 86 floor is skydeck.
It can be a good experience for a newbie traveller to visit twin tower. But i would suggest to visit kl tower among twin tower and kl tower.
The authorities will take photos for security purpose but at last they will charge 50$ for that photo (that s absolutely insane & Malaysian every tourist spot has this funny policy) it will take around 30-40 minutes to visit twin tower.