I've only had it a couple of weeks but I already love this tool. I use it as a non-techy single user in 2 ways;
1) I'll write separately, publish and then get the app pull it in to optimise. It's great for this as you can make small tweaks which have a big impact on your writing. It's so user friendly for this and makes it so simple to go edit your work. This feature is excellent on its own.

There are a couple of downsides, when I import from my site, it doesn't see the formatting so you end up with no paragraphs and zero photos which skews the results unless you spend ages reformatting. I'm not sure if that's because my blog is via shopify or not as shopify code confuses a lot of apps.

You don't get this if you write from scratch in the tool or copy and paste before publishing but I'm too lazy for that!

2) I also use the tool to build the framework for an article and then run those headings through a separate ai writer (or write myself) and come back and rework/optimise in the app. In this way, it does what Frase does but for a fraction of the price. It's just as easy to use and the onpage recommendations are quite good.
One thing missing which Frase does have is the ability to look at potential links (both internal and external) to include, since these are important for article SEO but it's not a massive thing since finding your own is probably better anyway.

It's post Black Friday and the busiest weeks of our year so I haven't had enough time to find other workflows yet but I'm sure there are a lot more ways to use the tool to speed things up.
It's already doubled my output speed and improved most of our current articles so it's definitely worth it!