I was using the free version of TabExtend, but was limited to 30 bookmarks. Not enough (surprisingly). I liked the design in columns, but it also meant that you could only have a handful of columns before you need to start scrolling sideways.

I also have TabsFolders, but its UI isn't attractive, and your starred items can't be clicked to go to the page; it takes you to the bookmark, which you then need to click. It just takes too long to get between pages.

I did a free trial for Superdense before buying and was immediately sold. It's really easy to set up, I can have WAY more bookmarks, and I can share folders of bookmarks publicly, which is good to share links with clients. My biggest fear was simply having icons and forgetting what the icon is, but you set a description which shows up as your cursor hovers over it.

Perfect.