I like that it's simple to build custom templates that look great in both our Marketing Automation platform as well as within Hubspot itself! Sometimes you can't find an option or feature you want, but with them being responsive they are always working hard at getting this right. There aren't any downsides yet so far, other than my own inexperience! If you're looking into building and managing your own templates then there really isn't much else out there. We've been using it primarily to create marketing automation campaigns rather than editing existing ones - it has made this process easier for us all. It's easy to customize, drag & drop features are really intuitive! There isn't much I dislike about this plugin but maybe it could have more templates available in free tier subscription? But you can make your own as well so that should not be an issue at all :) We use this tool mostly with our onboarding funnel of new users or leads we send out from webinars/sales pages etc.. The main purpose was just making email campaigns easier by creating automated emails using form fields (like subject line).