I have had the Pnuma for about 6 years now. When it's cold I put on top of my base layer and when it's really cold I put directly on skin. The vest does make a huge difference.
I’ve had a TideWe heated vest for a couple months now. I’ve used it whitetail hunting from stands and duck hunting. I absolutely love it. The battery it came with doesn’t last real long, but on high it’ll get you through a hunt. So maybe 4 hours, maybe a little more. It’s convenient bow hunting. Less bulk and easier to draw. Same deal putting a shotgun to your shoulder. I’ll continue using mine