I noticed this build is very similar to mine, http://us.battle.net/d3/en/calculator/demon-hunter#eZSdUT!hVU!bcbbcb.
I also like having impale on the bar to have one ability that hits like a truck to single target mobs :). If the resource generation system parallels WoW, which in my opinion it is, then quicker resource generation should allow for much quicker use of Impales or Multishots resulting in higher dps.
I feel that Multishot and Rain of Arrows might be redundant, sure you can probably have both going on the same pack at the same time, but you could also be using Shadow Power with Multishot for similar effects (I'm kind of assuming here that some of the higher end bows will provide piercing like in D2). I personally chose Shadow Power over Rain of Arrows for this, and the fact that it adds a second defensive cooldown. I might change my tune though if I start meeting up with packs of Lightning Immune mobs :).
My build compared to yours sacrifices the AE snare for the increased ability use though, so I would probably have to put that 40% dodge and tumbles to work a lot more often to make up for it. My concern on using a snare heavy build is what Inferno will be like with possible snare resistant or immune mobs, which generally are the only ones that don't fall over to AE attacks anyway.
If I found the hatred generation sufficient without the Entangling Shot glyph I might use the 6 targets one instead, but having Entangling Shot generate double the hatred seems like it would be pretty significant (hypothetically shoot every second or so for 8 + 2.5 from bat + some from gear = possible use of Impale every 3rd second or Multishot every 2nd second).
If grouped with others I would probably switch Vault out for Marked for Death glyphed for Mortal Enemy for even faster resource generation to pump out Impales like no one's business.
Depending on my crit rate and if I had a crossbow or not I might reglpyh Impale for the additional crit damage as well, that is stuff only the endgame gear will tell though!
Either way I think you have a good mix of resource generation combined with a very heavy hitting single target attack and multiple AE attacks.