I am using this extension directory for more then 5 years now, and just like the most users here, i pay for extensions sometimes. Memberships, donations? I've seen and used them all! Sadly enough not all developers are as professional as these guys! i tried several commenting extensions and even paid for them, unfortunately none of them seemed to work as i expected. Bugs, lack of support, messing up templates? Been there seen that. If i pay for an extension, i want to install it, set the options, and use it since i have a very poor knowledge of CSS, php and stuff like that.
I recommend RS Comments to all Joomla users. -Excellent support (within hours)
-Easy to use and setup
-User friendly website
-Works out of the box
-Need extra options witch are not integrated? u can ask them (ticket)
Worth every cent.