This is exactly what I need! Simple, no questionable/site conflicting designs, no function conflicts with my billion other plugins.
I have 8 sites, lots of plugins - on 2 MultiSites. I don't network activate plugins as a rule. I had already created some guestbooks with other plugins to have comments on my sites restricted to one page...with varying results, ugly or odd, no threads, etc.
Because this plugin integrates into WP comments, I don't have to disable comments or other plugins, or configure guestbooks and log-in methods. It is simply a part of the site function, with flexible features.
I use Super Socializer for comment log-in - I don't want spam, users have no reason to register - I don't do anything with it. Comment Guestbook works without any special configuration in the site admin or settings with Super Socializer.
Thank you for a great plugin! Your hard work is greatly appreciated.