I work with UX designers on a daily basis and creating personas is hard work. I showed the results of applying it to a SaaS platform to two of my UX team members, and they were impressed. It completes part of their work.
What we find very useful in improving landing pages: identified pain points and needs.
What we would like: to see what the social media persona will look like.
I don't know if it's on the roadmap, but creating audiences that can be exported to Facebook and Google Ads from personas will be very useful.
All in all, good investment Buying the second tier now.