Bill,
Thanks for the welcome.
The bivvy is about what you'd expect just looking at it... It's pretty crinkly but sized pretty well for me (6'0", 195-ish). I've only used it in real world applications twice... started off under the tarp alone and got a real good downpour. It seemed like less hassle to just throw the bivvy on instead of adjusting my pitch. It kept me dry from the rain, although it doesn't breath so the down quilt got damp.
If you have any specific questions let me know and I'll try to answer.
Best,
H2oBoy