Disqus Commnet Plugin and Multisite

Does anyone have Disqus installed on their MultiSite install? http://wordpress.org/extend/plugins/disqus-comment-system/

I have it on mine, but wanting to make sure it runs okay before I start installing it on a bunch of sites. When you activate the plugin, it says "You need to upgrade your database to continue." I am not sure what it is doing on this step, but I did "upgrade" on one site and it works ok it seems.

Anybody implemented this plugin on a larger scale? Is it stable?