I'm avaiting for hands-on real-life reviews, but I can guarantee you that this tent-jacket thingy will be clammy and damp. Not exactly the comfort level you're looking for when hiking or camping. But for survial / the unexpected night out, a waterproof cocoon has a lot of merits.

Personally, I think I'll stick to a bivy bag in my pack. And my "breathable" anorack and trousers.

I think this contraption can have some merits in the summer, or spring/fall in a more forgiving climate.