I just got one, that I plan to use on a hunt in New Mexico in January, so I haven't used it in the field yet.
It is longer than a jacket, but shorter than most winter coats you might think of. It is designed to be used with bibs. You could certainly use it without bibs, but you might get that "gap" Red Boar mentioned.
It is form fitting, to enable shooting with a minimum amount of clothing interference. It might be too form fitting for some, and will encourage me to keep the weight off I recently lost. I can shoot the bow with it on with no problems.
I hope it will be as warm as it is made out to be. As I said, it is form fitting, and so doesn't look like it will be as warm as some other down coats I have that I know are very warm, but then I wouldn't be shooting in those other bulky down coats either. I'll be bringing extra layers, just in case.