I'm a success story of using IPL laser to help with acne spots. I used to have brown and red acne marks and now am almost spot free! I paid for my first 3 IPL facials ($600 ouch!!!) and then bought a Tria laser (for hair removal) and started doing my own IPL treatments. It took over six months to achieve good results.
I'm sorry I don't have any good "before" pictures, but I just took one of myself today with no make up on which I am attaching. Most of the brown spots you see are freckles. (I never knew I had freckles before I got rid of these evil acne spots lol! I love my freckles) Let me know if you guys have questions about IPL therapy.
Also, check out my regimen. I use a moisturizer and an exfoliating treatment which target brown spots, and I think they also a good help.