I mean, it is a simple, no-frill test that gives your OK or NOT OK and highlights where it is. It is just a temperature check, this has to be used in conjunction with other tools for it to be useful. Since it is free I recommend running it as a check always.
SEOquake is a great tool to use alongside Semrush with the quick data that it provides on the search results page it's helpful to make quick decisions. The ability to change the SERP locale is also really nice as it helps us analyze the search results page from different locations.
Gives a ton of SEO info in one area. I usually have to use a few different Chrome extensions that show different areas to get the full picture that this tool gives you up front.
It gives you info on ways to improve the infrastructure of your website.
Google's suggestions are sometimes vague or unhelpful.
The test doesn't offer multiple screen sizes or shapes. Though this isn't a huge issue, it would be nice to make sure a site using media queries stays mobile friendly throughout size changes
The high-level parameters are nice to see, but for a new-to-the-tool person, they are confusing and don't provide a lot of explanation, unfortunately.
The keyword density section is somewhat helpful but gives the density in a percentage without rationale as to what an average percentage is or what the website should aim for.
I think this is a great addition to other search tools and a really quick and easy way to check how your pages work on mobile to ensure your users have the best experience.
SEOquake provides more information regarding backlinks and traffic in general whereas other tools focus more on keywords and their search volume. The backlinks information it provides is also really useful in making quick decisions on which site we can focus on more when it comes to searching for backlink opportunities.