I've actually had it for a few months now but never got the opportunity to use it until 2 weeks ago. I've been using it religiously since and can see a big difference in my lips. They look fuller, more defined! It has a very thick consistency so a little goes a long way..and that kinda justifies the price.
I have used other products from YSL's Top Secret's range and they've always worked, so I'm not surprised that this product does exactly what it says it will!