I am only 5'2", ordered the small and I find the arms to be short, to the point that the thumb holes are uncomfortable when my arms are fully extended. That material is regular sweatshirt material so I assume it will stretch with time but if you are a person of normal height I would think it would be more an issue and the description is not correct.
Besides that, the jacket is awesome and exactly what I was looking for, with lots of nice features like a drawstring waist and zippers on the side to adjust fit. I live in Portland, OR and I am cold all winter because of the damp. I could also see myself wearing this at the mountain on those rare cold blue bird days,