I just ordered a Jarbridge River with 3.0 oz Climashield.
I was looking for a summer weight UQ which I could use for 6-8 months of the year in northwest Florida. I have a nice down UQ from another vendor, which is great below 40°, but I wanted a synthetic to keep the CBS at bay above 45°. As an example, I often backpack in the winter. This past year I had nights in the 20s-30s in December and solidly in the 20s in January. Since then, it's been around 48°+ every camping night.
Though I have used my "winter" UQ for warmer temps, once it is above 50°, if I vent, I am risking exposure to bugs so I wanted something to keep snug at the more temperate ranges. I am hoping the synthetic will prove durable and effective in the environment whiere I exist.
Finally, I am hoping for something in the 11-12 oz range.
I have several trips planned in May (both static and backpack outings), so once I receive it I will have plenty of opportunity to report on how well it is working for me.