I ordered this as an insulation layer for an upcoming backpacking trip on the Teton Crest Trail but I can see using this frequently while belaying, biking, or just strolling around town.
The material is super soft and seems to be of high quality. The jacket itself is quite lightweight, thin and breathable. I've been very happy with this jacket on windy days as it does a great job cutting the wind. I haven't had an opportunity to test this very thin insulation on very chilly days but it seems like it will be warm enough for about the 40s, potentially even lower if you're generating a lot of your own body heat through activity. It seems like the side panels will help prevent overheating in such cases. The side panels are fleece which is super nice for movement and fit, though this may limit its windstopping abilities.
I really love the fit of this jacket. The sleeves are quite long with an awesome spandex insert at the wrists so that they taper nicely and fit well. If it were't for my darn climber (and ex-gymnast and vball player) shoulders and arm muscles, I would likely be a medium in jackets and tops. However, frequently I have to size up to accommodate--not always flattering. But this jacket is! It somehow manages to skim my torso, with room for baselayers but not restrict movement or comfort of my shoulders!
I ordered it in "Chartreuse" and I am totally happy with the color! It is bright and certainly wont go with everything but it doesn't come across as overly loud. I was a bit worried it would be more of a lime green or almost fluorescent but it manages to stay in the realm of acceptable outdoorsy colors that doesn't clash with the rest of my colorful gear and layers.