Decent plugin but has some issues

The settings for this plugin aren’t its own page, but a page within each CF7 form. I’m not sure if that’s any more of a limitation than strange UX. The plugin creates a cmatic_daily_cron cron job that is set to run once daily but often gets stuck and won’t run and refuses to run manually. Again, it appears to function fine without it – but then what is that cron supposedly doing?
Recently, there’s a new admin bar icon in the top bar, with a nag for upgrading. That alone is enough to make me not want to upgrade to pro (for some clients I use pro, for others there’s no budget for that).
Finally, when navigating away from any CF7 page, if this plugin is active the browser warning “Changes you made may not be saved” shows – whether you saved or not, whether you changed anything or not.

Anyway, its pretty good, but not great. (minus one star for the nag; minus one star for the browser warning and the cron job error). These errors make me doubt if its working and want to constantly audit the MailChimp list, but with dozens of sites using it, that’s a big task.