Conceptually a good app. Two major problems keep me from continuing to use it:

* Limit of 5 workspaces unless you pay $9/mo. Ridiculously expensive for glorified bookmarks.

* Functionality is super-wonky. Sometimes I get all these excess windows labeled "4 hidden tabs", which automatically minimize when I try to focus them. On top of that, whenever I restart Firefox, each of the windows I had open before begin focus on a brand new tab, and each of the windows I had open before open up a brand new window with a single Workona tab.

It's just a huge mess that is a pain to deal with. The admittedly cool benefits I get are not worth the money and the headache.