I have a bottle of Folie Douce in the EDT, and would love to chime in with another positive review, but sadly cannot. By no means is this a terrible fragrance, but to my nose it starts off beautifully then falls flat after just a few minutes.
As the wonderful Hillaire has noted, Folie Douce is primarily a sweet, creamy mimosa fragrance. The effervescent opening notes are indeed reminiscent of Champs Elysees - and I do love that scent! However, Folie Douce's sparkle disappears way too soon, leaving somewhat flat, sickly sweet dregs (blackcurrant plus ylang ylang?).
When the basenotes kick in, things improve somewhat: the dull-sweet, 'fruity' aspect is joined - and somewhat tempered by notes of sandalwood, cedar and musk (notes according to Fragrantica).
In summary, a potentially lovely scent, but I just can't love its middle phase.