The good qualities of this bag are that it fits entirely inside my larger backpack (important for plane flights) and holds a lot of gear (body, lenses, speedlight, batteries, etc.) without too much bulk. It's also easy to take on a hike and comfortable to carry around.
However, I have recently acquired a 5D Mark II and a 24-70mm f/2.8L, and I am considering upgrading to a nicer case/bag as I am worried about the ability of this bag to protect my heavy and expensive gear. I am paranoid that it will come unzipped and my lenses will just fall out!
In particular, one of my coworkers uses a Pelican 1450 hard case, and I am considering acquiring one.
I'm looking for advice here - should I get a different case, or should I go with what I have?