Looks like a great pack for my needs, been trying to figure out the best system for hiking and taking pics on the go. When I hiked the Grand Canyon I tried lashing a small Think Tank holster bag to my chest and while it worked OK for getting the camera out, it was a pain to put on and take off.
For me I hate loss momentum by having to take a pack off to pull the camera out and don't want my camera just dangling around my neck especially when I am scrambling. And like others have said here I need space for all my hiking essentials too like hydration, first aid, rain coat, etc.
Yeah its expensive, but I've always had great experience with Think Tank bags and if this lives up to that kind of build quality then I think it is worth it.