It so happened that I do have a site that is 'coming soon' where this plugin is perfect to deploy. So I tried it out as soon as the deal came out.

Check out live demo with a video background here - https://dealsinvestor.com (Site would be going live in a few days)

Pros:
- Easy to understand and get started
- Flexibility to use their layout or your own page-builder.
- Simple options to offer access to admin/designer etc
- Complete Whitelabel option
- Plenty of pre-made themes (some of these are absolutely fantastic)
- Integration with Deposit Photos (with choice of Unsplash or Envato Elements images)

No glaring cons as such. Will need some time getting used to.

Nitpicks:
- Natively integrates only with MailChimp, but you do have Zapier/Webhook for other integrations.
- With a background video, if your internet connection acts up, YouTube's error message is seen behind your content.
- Specific, minor UI elements are missing. Example: Button hover text color, Alignment option for Anti-spam message, etc. These should be doable by the devs as similar options are available for other elements.

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Installation and activation is like that of any other plugin. Once you start using it, there are a few things that you need to decide first.
- What brand are you representing?
- Are you using the in-built layout builder, some other page builder or custom HTML? This has a major impact on what all you need to do to set up the 'coming soon' page and where you need to put in more effort.

For the sake of testing the plugin, I chose to use the layout builder that is built in. It is quite straightforward to pick the elements that you want to use and then add content and customize each one individually, as needed. Other elements stay disabled unless you add them to the layout specifically.

There is a certain rigidity that comes with trying to use this option. It is functional but fine-tuning the presentation to be exactly how you want it might not be possible. That being said, I loved the filters that you can apply on-the-fly to the backgrounds, which include videos as well. (Excellent feature)

For fine-tuned landing pages that conform to the style and presentation of the brand and the about-to-launch website, I'd recommend using a page built with a 3rd party page builder.

I was not able to add an on-click popup form or even dynamically embed a form on the page (via ConvertBox). Setting up the inbuilt form to work with Automizy was a little bit of a struggle but, thanks to the super-useful debugging mode, I could understand and fix the problem without having to talk with support.

The ability to whitelist IPs and have custom URLs for specific users to login or preview the site is also very useful.

There are tons of more features in this plugin. Though there are free or bundled options for this functionality out there, I think it is certainly worth adding to your Wordpress toolkit.