Tried on the XL, which is my usual size. Felt true to size, and had good coverage down arms and waist. The hood is simple, with no draw string our other volume adjustment. Seemed warm for the two minutes I wore it. Very gossamer thin fabric, would not want to wear this anywhere abrasion would happen. Think of it as a sweater with a hood, depending upon actual temperature rating.
Comes in dark brown, black, navy blue, beige, maybe some others. I would say my Mont bell inner jacket is loftier by a small margin. Note that uniqlo has several styles, with and without hood, as well as some fancier designs that are more expensive.
I would say it's a good value, but I'm not sure of it's durability and it's absolute warmth. If I was in the market I probably would have taken the chance.