My verdict: a good tool, but not indispensable.
CleanShot X is solid and complete for Mac. The features (annotations, scroll capture, GIF) are well implemented.
But honestly, I don't necessarily see the point in paying for this when native or free tools already do 90% of the job. It's comfort, but not indispensable in my opinion.
What I like less: it's a 'nice to have', not a 'must have'. The value delta compared to the native macOS tool doesn't always justify the investment.
My advice: if you really take lots of annotated screenshots and scroll captures daily, CleanShot X improves the workflow. Otherwise, stick with the native tool - it's free and sufficient.