I think that at the very least you are going to be impressed enough with it to give it a couple of nights in the field.
The fully blocked baffles are about 8 inches square. The fill distribution is quite even in my sample.
Somebody in one review I read complained that the down cannot be shifted around to put more on top, less on bottom, but I think the coverage will be totally adequate for a 30 deg bag that weighs 19 ounces. I actually prefer the fixed baffles without down shifting. With a down hood and sleeping in other jackets or clothing layers, I am sure I could be comfortable down to 20 deg or perhaps lower. But, as you noted above, the lack of a top drawstring might be a limiting factor there, but I won't know for sure this season.
When it gets colder, I have a Marmot Plasma 15 which works great well below 15 deg in concert with other layering items such Montbell hooded down jacket and TEC down pants. Those things REALLY extend the temp rating - very comfortable near zero.