I've been using it since 1996 or 1997. Love it. Takes getting used to, of course, learning how to manage peeling and such, but it is worth it. I'm almost 40, and I have no real lines. Most people think I'm in my 20s, and the last time I went to a casino, 2 years ago, I was carded and they didn't want to accept my photo id as authentic. I've worn SPF 30+ for all those years, and never tanned before/after, and I never smoked, so guess that helped a lot. My mother, who is 70 and a smoker, has had a lot of improvement in her skin since I started buying her those little wipes by Dr. Gross, so I think any kind of chemical exfoliation is a Godsend.