Conduit SL & DriZOne Shelled Down Bags?

I'm looking at some 800-fill power down bags from both Mnt. Hardwear and Sierra Designs in the 20 degree range for use in Fall in Washington's PNW. I'm looking looking for anyone who owns one of these bags using this shell fabric.

I currently use a 20-ounce, GoreTex Bivy Sack (Moonstone) with a shoulder to shoulder perimeter zip around the head combined with an Arroyo +30 degree down bag which together both weigh about three pounds. Most of my Backpacking trips I use an 8' x 10' Sil Tarp 2 so I need a HIGHLY resistant (near WP) shell fabric. I know the seams on these bags are not sealed and that is A-ok.

Any owners of Conduit SL and/or DriZone shelled down sleeping bags, please respond with pros and cons.

Thank you

I have a Mountain Hardwear 3rd Dimension Storm Light, which uses the Conduit SL shell. This isn't a down bag, but synthetic (Polargard).

In retrospect, I wouldn't bother with the special shell on a synthetic bag. However, for future down bag purchases, I'd probably go for it. The pro are that it helps repel moisture. The con is that it probably adds some weight.

When I used my other bag, a Marmot Couloir, in the winter last year, I wished it had that kind of shell, as it tended to get damp from condensation inside my tent.

This isn't exactly what you asked for, but I hope it helps.