I live near Columbia's headquarters and took a quick look at the non-hooded version in the employee store today. I just tried it on and looked at it, so no comments about performance.
Subjective "feel" test: The fabric feels similar in weight to the Montbell UL Parka. I'm guessing it is hard to tell the difference between the 15d and 7d by feel alone. No idea about long-term durability, but it doesn't feel fragile (although like any UL down jacket, it should probably be treated with care). It does feel like each baffle has more down in it than the MH Nitrous (a comparison MH jacket that's been out a while) and similar to the UL Parka, although the Montbell baffles are larger so the down might spread out a little more.
My only concern with this jacket would be the smaller baffles vs. larger ones. I'm thinking of Will R.'s nice reviews (SOTM?) on UL down jackets last year. It could be possible to feel more cold spots from all the seams. I was inside a building and it's summer, so take that with the proverbial grain of salt.
Definitely a winner compared to the Nitrous and probably equal to UL Parka, if cost isn't factored.