Hello Olof and Anas,
We have tested and built our plugin over default WordPress themes like Twenty Twelve, Twenty Thirteen and Twenty Fourteen. And I myself have tested the plugin with a free theme named eSell which available at wordpress.org.
But I know you are talking about professional looking theme like those found at themeforest.net or something like that. We have not tested that kind of themes with our plugin. You might need to customize the theme templates to mach your needs.