It should be an essential tool for all website owners - everyone should care about page loading time from the CEO down to the junior web developer. Page speed is a factor that hugely affects visitor satisfaction, and Google takes it seriously by offering PageSpeed Insights. If you work in a larger organisation and focus on one particular part of website development and maintenance, such as a content writer, then this tool won't be as useful. It's intended for users with development or marketing-related responsibility
Rankinity is well-suited for agencies that provide SEO services for some clients. It's a great stepping stone tool while an agency scales it's services and builds a book of SEO clients since you pay per keyword check. The frequency of checks can be set for each client (project) so if services are performed monthly, you can set checks to happen at the beginning of the month
We've seen one major platform update (user interface overhaul). This has made the system much easier to use. There are some features that could still be improved like historical rankings but overall the system is good and aligns with the expectation for what you pay for it. Not a whole lot to complain about on the usability side of things
No chat support, only email support. Whenever I've used their support system, I have received responses in 1-2 business days and the solution addressed my needs/concerns. I've really only had a couple of instances where I've needed to reach out to their support team since the system is pretty straight forward and easy to use.
I've never used any software beyond PageSpeed Insights and Google Lighthouse (the source of the PAgeSpeed Insights software.) I've used similar programs like Hummingbird for WordPress that pulls the same data using the same engine, but its really the only game in town as far as I'm concerned.
Rankinity is simpler solution that's different than the all-in-one type solutions we've also used. A lot of it comes down to process and how service offerings are built for clients. We use Rankinity for clients where we're tracking a lot of keywords in a lot of different geographic areas because it's a more cost-effective solutions. But for larger clients, we typically rely on all-in-one solutions that offer more tools for SEO.