I went and bought some for my late season elk hunt.
I bought the celsius bibs, core layer, traverse layer, 90% pants, kelvin vest and jacket, traverse Balacava, jetstream hat and gloves.
I really, really like the traverse and core layers. Awesome. And the bibs were great too. All around a good buy.
I had single digit mornings and it didn't get higher than 30. I was active some times, not active other times. I sat against a tree on a ridge in the high wind with snow flurries and was comfortable.
I layered the core, traverse, vest, then the bibs and jacket. Some days I put an Arc Teryx fleece pullover in between, others I didn't. I was really overheated with that extra fleece layer and stripped that off. Some days I reversed the traverse and core layer, others I just did the traverse on the bottoms...really experimented different combo's.
Overall, I'm really impressed. I'll be buying the ascent gear next for my summer hunting out here. That Balacava is really great.
What I ended up with for most mid days were the traverse layers on the bottom, traverse and core on top, vest, and bibs, with the jacket on my pack.