Tom : Yes, I'll be happy to post about my experiences when I'm done with it. Seems pretty straighforward so far - I haven't even needed to rip any seams yet, but I guess that is inevitable, being the novice that I am. My first project was the Ray-way backpack, which was a challenge, but I'm benefiting from that now, knowing some of the techniques etc.
I selected the 3.7oz Climashield because I thought the default 2.5 Primaloft was going to be too little insulation (especially after looking at this picture), but lately I've been reading that the default is what the designer, AYCE, recommends for optimal drapability etc. Still, I think the Climashield looks and feels quite promising. We'll see how it goes.
Donna: Yes, it definitely got a stamp of approval from my cat :)