ease of use : ok
I found this extension really effective.
I tried other solutions for joomla 1.0 but they often doesn't work properly or have too many unseful functions to create template problems.
The strength of this plugin is its simplicity and functionality, what common users needs.
I looked at the site and a pagination function is wip. Would be perfect.
I hope this will become the "standard external" comment plugin for j!1.5, so I encourage you to continue developing.
Though it is a really 30 secs simple task to change .css, my only suggestion is to change that default blue-shock color cobination :)
What's about that 'blue-shock color combination': at last in February of 2008 it is not the only CSS 'theme', that yvComment has (and it is not default now) - two new CSS-e were added... but I left that 'blue-shock' (that you for the name!) CSS as an option, because some people appeared to like it :-)