I've been using and abusing the larger version of the Kata bag for 18 months now and it's not dead yet, something of a record for me and camera bags.
I've had all the LowePro slingshots and the zips all failed - the corners have too small a radius I think.
I've found ThinkTank stuff to be designed without the active photographer in mind. Most swearing I've done using camera bags were with ThinkTank stuff.