I have risers on a single speed road bike and now on my fixie. I noticed when climbing hills it keeps me in a good position to both stay seated and pull up pretty hard. I get up hills pretty quickly on the bikes with risers.

Also I hardly ever commute more then 7 or 8 miles one way on those bikes so hand positions aren't a problem. If I had a 15 or so mile one way commute though I probably would keep drops.