I have one and they really do keep you warm. I've sat out all day in 10 degrees with 20 mph winds in a treestand with a light jacket on underneath. Not saying I was completely warm that day but I wouldnt have made it 2 hrs without it. I haven't actually shot my bow while wearing it but practiced in the tree drawing and aiming while hunting and it didn't seem like it would be a problem. They have a suspender system inside and it holds suit from falling all the way down while your standing to shoot. I put mine on after I'm in stand and have safety harness on. It rolls up for travel and I bungee cord it to my stand and climbing sticks which is bungee corded to my backpack
You can get away with moving arms around inside and deer never notice. Also I think they contain your odor. Overall they are a worthwhile investment if your hunting in the cold. I'd keep an eye out on classifieds here or archerytalk and also check ebay. Mine is the updated model which happened around 2010 I think. I can't remember what difference is but my brother has the older model and he grumbles about something but I can't remeber what.