I purchased several of these jackets for staff at an EMS agency, as in Texas we can see temperature variations from 20 degrees, high wing, and driving rain, to 85 degrees and drizzling, where crews will still have to work outside for hours.
The jacket is warm. I've tried it on the Oregon coast, and in the driving wind in Texas, and it performs well in both with the liner. The liner comes out easily, and I would say the liner alone is a puffy, light jacket that is "warm enough" but I am not wearing it out into the wind. The outer shell performs well as a windbreaker and rain jacket, and I chose the jacket for this feature (and the zip out armpits).
One failing for the jacket is that the silvered lining is very puffy, and will come out the sleeves when you quickly slide into the jacket. The crews are opposed to the silver lining shining out at their wrists, but you can tuck it back in; not ideal, but not a deal-breaker.