Functionality rich, but these things are problematic as a whole these days. Maybe that's just how the iFrame thing has gone.
The worst thing about this is how there's no auto-update ability for it, so you have to keep coming back (even for the initial support period) to keep updating it whenever it changes. This has got to be a security issue as well as an inconvenience and seems like it should not be an issue. I get why if you have not paid for it this irritation might be built into it (like Beaver Builder and others do) but why is this not fixable, except by installing the Envato plugin too. Also, if you do fix it so it works in standalone, please do not then have it nagging you to buy it again after the support period. I know that is something you will likely want to do, but it will annoy me :D
It also annoys me that you have to have some random 'extra plugin' installed in the list of plugins for it to work. I am not sure the technical rationale for it, but never seen it elsewhere. I am sure it makes little difference to site speed/memory/space, and that it is not a huge security threat, but it does mean you have Wordpress saying that you should not have extra plugins and the column on 'enable autoupdates' always has (at least) these two things that do not go away and you get reminders to 'switch on' autoupdates for.
The ability to mess around with all kinds of features to customise is spectacular, but confusing at times. Probably much of that is unnecessary in most cases, but for me it has been okay for what I needed.