I tried Obagi a couple of years ago, with the Retin A.
Did it work? Well...yes, and no. The products were good, I liked the texture, and they moisturized well. But basically, I went through a month or two of just awful, red, peeling, gross skin.
When it was done, my skin looked FANTASTIC...for about three months. But, every time I had a glass of wine, my face would turn bright red! It's been years since I've used Obagi, but I still have a little of that red-face effect. Also, when I started Obagi, I had normal/oily skin, but now it's *dry instead. Honestly, I'd rather have my oily skin back.
However, when they did the UV scan of my face after the treatment, the sun damaged parts did vanish. So that's good, I guess. I wouldn't do it again, though--I don't think it did me any favors in the long run.