I tried four of them a week ago - they didn't have Flash Back, unfortunately.
Chambre Noire was the best that I tried, in fact I was tossing up which of Chambre Noire and Cuir Velours to buy. I ended up going with the latter, but it wasn't an overly simple choice.
Still Life is a really good yuzu fragrance; I traditionally dislike yuzu in perfumerie, but Still Life smells so realistic and doesn't smell sour in the least. Projection seemed rather low.
Lumiere Blanche is a little soft for my liking, and somehow smells simultaneously unique and bland. It seems to be one of those fragrances that will react differently with different peoples' skin. On me it's inoffensive and starts off smelling like laundry detergent, but then dries down to a mix of flowers and woods. Nothing remarkable.
Autoportrait is a fragrance for those that really like elemi, and although I give credit for trying something different, as they've taken what's normally a supporting note and put it centre stage. It dries down into a very soft wood fragrance. It's my least-favoured scent out of the four.
I was given a sample set of the four, so I'll give them more of a try over the coming weeks.