The big advantage I find is that at the bottom of each hub, directly under the line of Vote Up, Share, etc. buttons, a link shows for my hubs I have grouped both before and after this hub in that group. So, other hubs I have grouped together in that topic have a kind of chain linkage a reader could cycle through from hub to hub in a given group. I don't know if I am explaining this very clearly, but hopefully if you look under the Vote Up line of buttons and click on a few, you'll see what I mean. We can control what hub titles of ours that appear there by changing the ordering of hubs within each of our groups.