From what I understand, Jerry Miculek uses a serrated trigger, but I can't stand 'em, myself. I feel it causes my front sight to bob around more.
What was the slickest (IMHO) back when I was 'smithing was to use a wide serrated trigger, take the serrations off, and shape the trigger into what we called a "diamond shape", which meant reducing the width at the top and bottom of the trigger, breaking every sharp edge, and putting a mirror polish on it. That was a really nice setup for DA shooting.