I really enjoyed using this component, and found it to be a really quick install and quite functional. The only drawbacks I faced were minor CSS disruptions and the inability to use Jcomments in accordance with Multi-Categories. Since my comment system is quite important to my site, I wasn't able to use this component to the best of its ability.
Multicategories support will be added in JComments in the next version. Currently it can be implemented by making some simple modifications into JComments. You can find the solution at http://www.joomlatune.com/forum/index.php/topic,2241.0.html