Hello fellow demon hunters, i come to report my successes on the ptr server with the new rapid fire buffs. Now i know its not the greatest dps skill and it's single target aspect is not the greatest, but what it does give is good sustainable dps. I've managed to get unlimited rapid fire with some skill combinations and lowish aps(manticore is probably the best weap for this, just like for the strafe build). I was able to kill all the uber bosses on mp10 for the first time solo with my 200k dps w/ soj DH. Here is the build i used
http://us.battle.net/d3/en/calculator/demon-hunter#Rcghkd!XfU!YbYZcb. It's pretty simple, use marked for death on the first target you plan to kill, then pop shadow power and then just hold rapid fire while you cast your sentries on top of you. Like i said at the start, it's not the best dps skill, but the snapshot effect of rapid fire and shadow power really helps to keep you alive.
Hope you enjoy