It is a very good add on that gives your self-control a bit of help. Obviously it's no match for a determined frickarounder, but does objectively help quite a bit. -1 star because they took away the quick add to block set option. If I want to ADD a site to options, I have to go into options now. Also, it would be nice if it required a restart to disable this add on. As it is, it does not.
You can still add the current site to a block set. Either right-click on the toolbar button or on the web page. As for preventing disable, see this FAQ entry: http://www.proginosko.com/leechblock/faq/hide-addon/
