Dooney makes a range of products to fit into various market segments. Some of the lines are very high quality, like Alto and Florentine. Some of these bags are sold on QVC and some are not. The ones sold on QVC are the same quality as sold elsewhere. But not all Dooney lines use the same leathers or finishing treatments. They make different lines to fit into different price points.
Dooney, like many manufacturers sometimes makes styles exclusive to a particular store/customer, like QVC or Dillards, etc. In those cases, they will tailor the style, materials, details, etc. to what that customer wants. So, if Dooney makes an exclusive for a store, it may not be the same quality as a similar bag sold elsewhere... or it may be exactly the same quality. It may have extra pockets or zippers, or it may have a different leather.
As for the straps that are adjusted with a brass button thru a button hole slit in the strap... Dooney has been using this technique on many of their bags for decades.
I prefer a buckle, but the brass button seems to be a style thing popular with Peter Dooney.