I have a TNF Nuptse which seems comparable to these. I wouldn't be wearing it in -20F, but I get cold easily. Personally, I would go with something with more insulation, but they aren't cheap. Mine retails for about $500. Got it on eBay.

Mine is a TNF Baltoro (older version of the Himalayan) with 700 fill. That jacket is a Dryloft shell, has a big puffy hood and weighs a couple of pounds. It stuffs to about the same size as my sleeping bag.

There are some pics of me in it here somewhere-winter forum or trip reports from a couple of years ago. In this pic you can see the difference-big insulated hood for starters.