I run a website with HUGE articles and over 40k articles. The default Pagebreak plugin which can create TOC, just really isn't efficient for my site. This plugin saved the day with it's Dropdown feature. It is user friendly and works flawlessly.
One thing I'd love to see added to this plugin is the ability to set TOC based on where Pagebreak code is placed within the Article. I had to disable the Joomla Core Content - Pagebreak plugin, but there were areas where I still wanted to use it, and had to modify those areas to not use Pagebreaks anymore.
Otherwise. Awesome plugin!