Hi,
Thanks for the interest in our plugins. I can answer your questions.
I am not sure what reviews you are referring too.
The plugin is full responsive and we have not gotten complaints directly from our customers about it.
You can test the responsive look using the core version of the Events Calendar found for free on WordPress.org: https://wordpress.org/plugins/the-events-calendar/
Also, you can see how it looks on our demo site:
http://wpshindig.com/events/
We are always interested in improving the plugin, but so far we have not gotten feedback that is needs work so we do not have any plans to change it at this time.
Let me know if you have any follow up questions.
Thanks