To respond Chris and Daniel's questions, I completed a short section of the PCT with the Murmur this past weekend.
Bottom line: I am impressed with this new pack.
I was especially pleased to find that all the gear that would normally fit into my GG Miniposa fit nicely into the Murmur. The only exception is that I went cookless, and did not pack my regular kitchen setup (MSR Kettle Pot and Esbit stove). However, it too would have fit.
Here is a list of some of the items that made up the 7.5 lb base pack weight:
Montbell SS 50 degree bag
GG Nightlight torso pad
Clothing in a small GG Stowlight
GG The One
Patagonia Puffball vest
O2 Rainwear hooded jacket
GG Sitlight pad
1 liter Platypus
2 liter Platypus
I wanted to test the pack’s recommended max 20 lb limit so I made sure I started the trip with 3 liters of water and 7 lbs of food.
Here is a self portrait of me wearing the pack. I used a nifty new device, the “Stick Pic”.(http://www.thestickpic.com/). It fits on the tip of a trekking pole.

Additional pictures of my trip:
http://picasaweb.google.com/beemancron
Happy Trails