I've got that bivy. My wife got it for me as an birthday gift before a hunting trip last year. It's not bad. Setting up is easy, putting it away isn't quite as easy, just a lot of stuff to make fit in that little bag. I haven't been in any really bad storms in it, but did have a light rain one night. It held up fine. Inside space is about what you'd expect, enough room for a 6'2" husky guy and packand little else.
For a night or three hunting, it's great. Any more and I'd rather take a larger tent. For what it's worth, it does spend it's free time in my truck bag.
If you have any more questions, I'll try to answer them for you.