Guerlain Meteorites finishing powder

Who used to use or us using this product ka? There are 3 shades in this product na ka, and i wonder what shade I should buy ka. I think I have a yellow kin tone na ka, not really sure....because normally I will use only primer and loose powder before I wear a make up na ka...No need to hide any acnes na ka..

If so, what are the pros and cons of this product ka?

How much is it in Thailand ka?

COuld you explain how to use it in each color?

Thanks a million ka :)