I have the older Farwell I bought about 10 years ago for a horseback trip. It kept me warm with the insulated BA pad down to about 20 deg. I since bought a 0 deg Slick bag ( side zip) because it’s slightly lighter and compresses better, however the Farwell was definitely warmer than the Slick bag. Because of my I need a long wide so I’m used to the weight penalty. The outdoor vital looks pretty good but the long is only a couple of ounces lighter than the Farwell. If it’s closer to a true 0 deg rating than it might be worth it
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Not slamming the Slick I really like a lot of things about it, just not even close to the temp rating in my experience