Disadvantages of using Disqus as your commenting system: 1. Your comments are in disqus, and not local to your server 2. Users with JS disabled are not going

Disadvantages of using Disqus as your commenting system: 1. Your comments are in disqus, and not local to your server 2. Users with JS disabled are not going to see the comments 3. Friends and other would-be commenters may be banned by Disqus without having been banned by you. As to point 1, I believe there's an API that you can retrieve your messages from if you ever want to migrate away from Disqus, but the other two (I think) hold true no matter what.