[karmakal]

Wouldn't have picked this option but it came with a pack.
I must say I like it a lot, even though cartridge price is quite steep.

I find the fragrances very discreet and refined.
Its not a constant smell, more like periodic sprays. Its quite subtle and I definitely enjoy it that way.
You can tune the intensity (= frequency of spraying ?) from 1 to 3 through iDrive and I can definitely smell it, even on 1 (the lowest setting).
System is integrated in the gloves box. I appreciate not having a ugly plastic pad stuck on the dashboard our dangling from the mirror.
Being able to switch fragrance directly from iDrive is nice as well (choice of 2 cart.).
There are 4 suites of fragrance, each suite available in 2 versions : light or strong.
Green and blue suites are my favorites.

I spend about 150 eur / year on cartridges. Not cheap but worth it for me.
I'd tick the option again.