I've been using the first version for a while, on a limited basis. I was very happy with it's ease of use and implementation but the single biggest downfall was not having the ability to turn on comments based on categories/sections/pages etc. The new version now allows selection by either category or menu item. This was the last piece of the puzzle to make this a first class plugin. Disqus/Facebook/Twitter login options work seamlessly. The only issue I had was with uninstalling the previous version. I had to manually delete the old directory in order to complete the upgrade.
Sign up for a Disqus account and give this plugin a try. It's simple and well worth it.