I want to use a comments platform on my site. I thinking of using http://disqus.com/ Does anybody used it as an owner of a site that needs comments? I wonder if this is a totally free service. Or do they charge in any stage over time? Can I depend on it, for the years to come, assuming that it is and will be a free service, with reliability too? I don't want to use something that is not free, or unreliable, and looking to change it after a while. I wait for your opinions and experience, as site owners.