Summary: I've owned and abused one of these for many years and it's still going strong. It is regularly dragged up and down mountains, through hedgerows and across bogs. If I did ever manage to kill it, I'd go straight out and buy another. Great design, very well made.
Pros: tough, well designed
Cons: can't see your feet when it's on chest harness
Summary: I bough this pack after owning a TLZ 1 which became to small for my D1 camera. The provided chest harness is really nice, I use it all the time while hiking or backcounty skiing here in Norway. I can squeeze in The Canon 20D with grip, 200mmL (in front puch without the hood) and 17-40 on the camera.
Summary: I bought this bag for its raincover and verstile carying options. With the chest harness, I use the bag when heading out into the backcountry. This keeps your camera easily accessible, protected from bumps and the rain, and saves you trouble from fumbling with your pack.