We have been using the plugin for several years on the premium version. The plugin has been really stable and compatible with our theme other plugins and WordPress core.
Recently we stumbled into an issue with the plugin not storing data correctly after an WP core update.
We wrote the support who was all over us 24 hours replying faster on our questions than expected.
Via the dialog with the support we got the issues solved which involved and update of the plugin to the newest version.