I also run 2 lights on the bars and one on my helmet (all on non-flash mode). That much light thrown forward tends to make motorists stop and think about what is coming at them before they pull out in front of you.
+1 I have a 900 lumen wide beam, a 400 lumen spot and a another wide angle 400 lumen on my helmet. I definately get seen. I had one guy on the bike path who was walking the wrong way compain they were too bright but I make sure they are aimed low enough to avoid blinding on coming cars while advertising I really am there. I also use a wide light strip on the rear basket of my commuter with two small flashers on the corners to really make sure people know I am there.