You can select the number of public posts to display and choose the background, border, text, and link color. Width, padding, and border radius are also adjustable; height adjusts automatically. The header and footer can be turned on/off as well as favicons of the content, if any, linked to on Google+.
Having the count of people that circled the person and number of +1's per post is really nice. The functionality will certainly get better as Google expands the API. With read only capabilities right now having dynamic interactions is not possible. Even still, this is a great widget to put on your website to gain more circlers. Just head over to the Google+ Widget website to start building your version.