In reply to steveshaking:
Yeah, the hooks have a habit of detaching and only really work properly under load. I've used a Blue Ice pack which had them and they kept coming off and flapping about.
The LL buckles have an extra hook which keeps them strapped up. I've snapped quitell a few standard 25 mm buckles in my time. As I'm having a pack built I'm keen that is as robust as possible.