I've run the sanctuary bibs for a few years. Hunt in Northern NY, ADKs primarily and would consider myself to have a pretty good cold tolerance. Many times my sits are dark to dark in Nov. These bibs are good bibs but with out proper layering you will not make it all day on stand below 15-20 degrees. I typically wear merino long johns, and stratus pants on the walk in, I put some down glassing pants on and then my bibs and they are comfortable all day.
I personally run gray wolf woolens now, different class of clothing altogether and you'll pay for it. As for the sanctuary bibs, i think they're very versatile, the zipper system is great, zips from your tailbone all the way to your ankle for a full vent. I like the cargo pocket design, they have an elastic band in the top of the pocket so you can stretch them out and load them. They also have a more secure zipper pocket right above the cargos if you want to store keys and what not. The butt has a thick DWR type finish which is nice if you ground hunt. They struggle in the snow though, especially if its wet snow. They will get water logged on long sits, they dont retain warmth well when wet either. So if you hunt in tough conditions for long periods of time, something to consider. In my mind when I put on a bib I shouldnt have to worry about wind, snow, cold, etc. Overall a solid bib though.