My favourite Sisley product is Creme Reparatrice (Restorative Facial Cream). Says it's good for sunburn and dry wind-whipped skin, and I don't doubt it, BUT I personally have found it awesome as a night-time moisturiser, and I have to admit to sometimes having used it during the day (I'm in my mid-forties btw). I wouldn't use it all the time though but for a few weeks or when my skin feels like crap, it is the business!
I also have Sisley Ecological Compound on the go throughout the year, especially as my sole Summer daytime moisturiser - I'll stick it under any other moisturiser in Winter. Tbh, I'm never really sure if it does anything or not, but I like it
, and my mother swears by it (as does her nearly 70-year old face!) so I'll go with it...
They also did a really good face-mask that I liked (don't know if it's still going) called Linden Blossom. I would like to get that one again.
Also had a love-in with their Hydra Flash facial cream for many years and would probably love it now if I had some. And there was also a fab eye cream they did with tomato in it (now discontinued) and also some sort of seasonal anti-aging glass capsules (think again now discontinued) that you had snap open and facially apply - loved those, used to get them as freebies with an order and they were darn good.
And then they started their anti-global range - just started getting too pricey for me
so I can't really comment as to their effectiveness...
Thing is I started getting into Sisley when I was in my twenties, and I've come to the conclusion that as far as my skin goes, it's all more suited to late 30's/early 40's +. I've come to that same conclusion with a lot of brands though.
Sorry for the Sisley ramble! All I can say is that I've still got some Sisley on my dressing table after 20 years! LOL!