On my site I use the comment system by Jacob Barkdull, for all details see
On my site I wanted a fully responsive setup that works on all devices, and made the CSS to suit. I demonstrate here a basic version of that CSS, for comments with borders. I also have a responsive demo without borders at HashOver responsive CSS demo - without borders.
Note that some of the comment code itself may not work as intended, this is not a fault of the comment system, since it has been modified for this site specifically for use in conjunction with the site CSS, and you can see that in operation on the main site pages. There is some (unoptimized) JavaScript code to make the text input areas resize automatically.
The CSS for this page includes basic media queries with one breakpoint. You can access the CSS code through the folder hash-comments.
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End of comment section