The new 2010 models are a vast improvement on previous designs. The continuous stays across the back of the pocket add strength and a more natural curve to the pocket. This allows the pocket a better hold on a larger range of objects including perfectly spherical ones which are the most difficult for a sling to hold and let go of well. These stays also allowed the chance to drop the side rivets for an even lighter sling... at least I think, I haven't actually weighted them yet.
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