I bought this for winter running, and it's worked very well. I've used it as an outer shell from about -10 to +35 this winter (with appropriate layers) to keep the Montana winds off me while I run. It works very well at blocking the wind, as the name would suggest, but it's not just a trashbag with arms. Under the arms and down the sides (the darker fabric on the blue one) is a thinner, stretchier, more breathable type of fabric. It's not so thin I notice cold spots, but it does seem to help. The fabric everywhere is very fine, so it's nice and quiet while moving, more like a softshell than a hardshell in that aspect. The other things I like about it are the length of the zipper in the front, it increases the versatility of this piece a lot, and the collar. The collar stands up well enough when fully zipped to allow you to warm up, and the zipper hides under a nicely sized flap so it doesn't touch your skin when fully zipped.
I got a medium in white, and I really like the fit. I'm 6'1", 180 lbs and I can wear a relatively heavyweight mid layer and a base layer underneath no problem, but it's not baggy when I'm just wearing a midweight layer underneath, basically I think the cut is great for athletically shaped people. The hem is dropped in the back for good coverage, but it's not as pronounced as bike wear, and I haven't tried it on the bike yet to find out.
It folds into the small rear pocket you can see on the back, ends up about the size of a wallet, so very packable. I am a bit worried about the long term durability, but I might end up buying a second one just in case. It's also clear in the pictures, but I know some people like things like velcro cuffs and hand pockets. I am glad this has neither, but you should be aware before buying the cuffs are simple elastic and the only pocket is small and awkwardly placed, only really useful for IDs or money and to stuff the jacket into.
If you like to run in the cold, get it!