I like the simple, user friendly process and the manager that helps organize your uploads. It even opens PDF and other files in a separate tab in the browser, which is beyond what I expected out of an attachment add-on and fits just what I need!
Even though it is not exactly embedding the files within the article, it's good enough for me and my users - just clicks and no syntax issues. :)
A suggestion: to include Access levels in the window for Add to Menu. Since I am working on a site that contains many registered access articles, I still find myself having the need to go back to the Menu Manager and update the access levels for the items.
Hoping to see more NoNumber extensions released in near future, good job!
Though, NoNumber can consider an integration between tabber and sliders, as I find that these 2 are being used increasingly together.