I haven't given SerpStat a full workout yet but ran through a lot of the features in around 50 minutes and did something like 5 PDF exports ( with some other exports directly to GSheets (slick integration there that I wish more data providers would offer)).

My primary use is for web research and lead prospecting (but I'm also planning on adding my project to SerpStat shortly). I'm a long-time user of SEMRush, which is great in its own right, but in a side by side comparison, SerpStat looks to have even more features and the price is so good here, there is no comparison at all. FWIW, I haven't dug into the data quality on SerpStat yet but side-by-side with SEMRush and actual Google results, it looks B+/A-, which is just a slight tick lower than SEMRush (for the uninitiated SEMRush costs $999/yr minimum and $3999.yr for the business plan).

I've also tried SERanking through my BriefcaseHQ subscription, and while good quality data there, the daily limits are so restrictive, it's next to worthless for my purposes.

So, for similar purposes to mine (research and prospecting), I give max tacos due to tons of useful features in SerpStat and because the price here is less than 50% of 1 month of SEMRush (insane!). If on the fence, I would suggest grabbing this while it's still available. I miss the days of 1-off purchases for sweet software but SaaS is here to stay and deals like this are far from the norm (have literally been waiting for this one for a year and so glad I checked AppSumo this week).