If the OP is anything like me, the concern over losing Puncture is less about a DPS tradeoff then it is about what happens in low rage situations; devestate was a great move to do for cheap when you were rage-starved. I specced into Impale/DW a couple weeks ago, and there certainly was a change in running dailies; I have to be more careful to "dress down" so I get enough rage from being pounded on so lightly. That said, it only took a day or two to get the right mixture for my grinding/over-geared-content outfit, and the DPS/threat boost from the new spec is fantastic.
True story: in Heroic Gundrak a couple days ago we were trying to kill the first boss for the third time (we had no ranged DPS and one was a bit underpowered) and were doing quite well until 20% when we lost our DPS guarding the healer, and suddenly it was me and a feral druid; I popped my CDs, she (the druid) died at 5% and I still had 50% of my HP, but before I could kill him I got cocooned and died...except that he had DW ticking on him, and he died from the DOT moments before I died (still in the cocoon).
A fairly unusual example, but clearly would have been a wipe without going with the Impale/DW

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