I had a decent sized sample of this (probably from some Sephora event) and, in spite of the off-putting smell, I really liked it and felt it delivered on its promises. I was getting near the end of the tube and was going to purchase it about 2 weeks ago but hadn't had a chance to get to Sephora. Then I was looking for its reviews at the Sephora site and saw that this has been reduced in price (it's almost half price now) AND was available in-store at the location near where I teach - double bonus!!!! I picked it up yesterday and I'm so glad to have it. I'm also glad I didn't buy it a week ago at almost double the price! As the warm weather approaches (heck, after a harsh winter, it basically landed on us like some boulder - 31.5 Celsius yesterday - sweltering already and it's still MAY), this will be a perfect summer night time treatment product as it's not too heavy and can be used under your nighttime moisturizer, if you wish, so in that sense, it's versatile for all year use. I find that when I use this (2 to 3 times a week is recommended), my skin looks brighter and feels smoother and "tighter" (in a good way) when I wake up. The SA at Sephora told me they are going to be bringing this back and that REN is sort of reformulating a lot of their products. I sure hope they don't mess this one up when they do this, as is so often the case. I may well go back and grab one more of these at the sale price.
2019 update: I am still loving this stuff and was ticked when Sephora was suddenly no longer carrying it. I was able to get another tube of it from Amazon.ca (it just arrived today). I am so happy that I've found another source for this treatment product. I hope it will continue to be available in this way.