I'll echo all the feedback with regards to the collar. It has taken a while to get used to it. I found that if not paying attention when I put the jacket on, the collar can fold under and cause some discomfort. Easy enough to deal with. The kidney belt is great. I wear one anyway so with the built in belt I don't worry about leaving it behind somewhere. It also helps to keep the jacket fitting nice and snug if I want it to be. The cuffs....what can I say but a little annoying. I'll be removing them.
The space for a hydration pack was an afterthought and it really isn't convenient to re-fill a bladder but it is nonetheless there if you need it.
Badlands Pro Jacket Hydration system