Thank you guys. I am also happy to join this forum. many great threads here.
Here's some pics of my woobie.
Before Compressed

After Compressed

And share some experience
Pro:
-lightweight (1 lb 6 oz)
- Good compressed
- Quick to get warm. If you will use it around 50F, you better wear the mid-weight under layer.
-Durable :so far the fabric and insulation have no problem (I have used the woobie for 6 months)
Con:
- Expensive
- the fabric is "slippery"
thank you
Wolfmen