I see very few people with dyskinesia at support groups meetings nowadays. I started on a DA, two years after diagnosis (Oct. 1999), but eventually like everybody else, I was advised and wanted to go on Sinemet and have taken that now for 10+ years., no dyskinesia yet. I think careful (go "low". go "slow") and only adding small increases over the years could be a factor., so could individuals' different sensitivity to levodopa, of course.
. I agree with Peter and find that there are fewer side effects with Sinemet. They are now my favorite pills, could not function without them.