Although I'm complaining about it now, I've used Retin A Micro in the past and it worked really well. I was on it for two years straight with perfectly clear skin. But I got sick of paying so much money for it and thought I didn't need it anymore so I stopped using it.
My skin was ok for about 6 months after stopping using it, but then I broke out really bad again. Now I've been on it three weeks and I had to go through all that horrible initial breakout/ redness/ peeling stuff again.
I'm assuming since its worked for me in the past, it will work again. I think last time it took me a good 5-6 weeks to notice an improvement, but I don't remember for sure. I hope it works for you!