Just received my Brooks hooded down jacket so figured I’d throw an update. I can only compare against the KUIU Super Down as it’s my previous puffy. I’m 6’-1” and 170# and the Large fits well. For me, the KUIU was short and boxy, and the Brooks has a more athletic fit with longer arms and sits lower on the waistline. I much prefer the fit of the Brooks. Also, the fabric feels far more robust on the Brooks and isn’t nearly as loud... still not something I’ll stalk hunt in, but might actually work as an under layer. The dimensions and material are such that I’ll definitely wear this jacket outside of hunting, so I’m planning to get a lot of use out of this piece.
It appears the loft is less than the KUIU, though it did just come from the package so I’ve hung it to see if any volume springs back. Can’t comment on warmth as of yet.