I like how easy it is set up - no coding required! It's also very flexible in terms of design customization (and you can have multiple themes).
The only thing that could be improved would mea sure more templates are available so one doesn't need 3rd party services such as Mailchimp/Hubspot etc.. We use this widget mainly because we don’t want any additional software or plugins installed when our clients visit us online since they already do their own website development work themselves with Wordpress CMS platform which has its pros & cons but at least there isn;'s anything extra needed from client side aside form WordPress itself!