Got a bottle of Murmure cheap at Marshall's last year, almost by chance but not entirely blind Your observation about this scent being capricious is right on: one can never predict which note will be loudest this particular time, and sometimes it does behave in a discordant way, like a garment that's too stiff from too much starch on it! I crave it on the hottest days of summer, as there is certain coolness about the whole composition, even in 3 -4 hours after it has been applied and should become all mellow with vanilla and woods. Some people can't cope with its rosewood, others find its cassie flower too peculiar, but they are what makes Murmure stand out.
Jasmine in general, I noticed, is a very sensitive note to what you ate last night, and after a couple of experiments with Indian and Mexican cuisines, I figured out that Murmure smells better if you do not consume too much spices (same can be applied to Montale Jasmine Full!).
That being said, let me point out I am not going to part with Murmure any time soon, although I would gladly make small samples to anyone willing to try it.