Also, I wouldn't rush out and say Dr. Lam is the foremost expert either. He definitely has the gift of gab and can sell ice to an eskimo, but the actual results are not that great. Take a look at his pictures. They are modest at best, and some are just crappy.
Dr Lam is probably the biggest expert on silicone for acne scars. I agree though - the pictures on his site aren't that impressive, but IMO that's what the results are actually like vs the pics Dr Channing has on her site and why I said the OP should go look at them.