My son had a kids BA bag...it was pretty convenient (especially for kids b/c I never had to worry about him coming off the insulation). Like Roadtorque said, they're a bit heavier than other backpacking options out there.
Sometimes I just use the Exped Downmat 7 and a quilt...much lighter than the BA and I've never had problems staying on it or anything. Used it on the ground with no problems as well. So the BA is a good idea if you're willing to pay the weight penalty, and they're not very expensive compared to the high-end lightweight bags, but I never saw the benefit worth the weight for me.
FWIW, I don't need a SPE or wing pads when I use the Downmat 7. I inflate it fully so it sits me up high enough in the hammock that the hammock can't squish my shoulder insulation. You may find the same thing with the 25" version even if you don't inflate it fully.
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IMPOSSIBLE JUST TAKES LONGER