I have the Royal Falcon Jacket and found it to be just fine for my purposes, it keeps warm after I stop hiking for lunch or at the end of the day. I've gone out and spent a couple hundred dollars on so called high end quality jackets just to have the stitching start coming apart in a few days. If you start checking the labels you'll begin to see a lot of the high priced labels are coming out of China. Clothing has a 3000% mark up when it hits the retail market so don't believe that a high price equates to a quality product.
As far as temp rating the jacket, I think 35 degrees is it's lowest limit without adding a mid-layer I think 50 to 55 degrees would be it's upper limit before you start overheating. I have yet to figure out how to pack the jacket into it's own pocket without at least one zipper being exposed, so I'll just stuff it into a small cuben stuff sack.