I looked through a lot of different options for a comment system on my music site before finding this component, and I have to say it is brilliant. It works straight out of the box, and is very simple to set up. I started with v1.01 which was pretty limited in features, however very simple to use. After upgrading to the current version which allows email notifications, I was having a small problem with the system working, and contacted the developer who was very quick to reply, and helped walk me through the problems until we found a solution to the problem.
I am looking forward to the new version coming out later this month, and can definitely recommend this extension to anyone needing a comment system on their site.