I am testing the extension on my 3.1.5 site and it works fine so far. It would be nice to have an option to change font colors but it can be done with a little fiddling. And maybe an option to display a picture next to the text, but probably it wasn't a purpose of the module. :) I haven't experienced any issues so my satisfaction.
Looks good and does what it says. However I decided to use another extension, because I did not find an option to turn it off on category view (without changing the core files). It might be the next step for developers when upgrading the extension... :)
Great extension. The only thing I am missing is a pin button. Ohh, and maybe the possibility to change the background and border of the plugin. Anyway, I customized the css file and everything is perfect. I recommend this plugin.