My Experience with Strell
Having used Strell recently, I can confidently say it's quite a game changer in the SEO realm. Its ability to find easy-to-rank keywords reminds me much of the Lowfruits feature, while the Audit tool is strikingly similar to Neuron Writer.

What I Think Are Some Superior Features Of Strell
Writing SEO-optimized content has never been so straightforward and efficient. Strell does an excellent job in decoding Google's ranking criteria and providing exactly what Google needs to see on the page. I appreciate the real-time SERP Analysis that fetches PAA questions and related searches for each keyword I analyze. Plus, the LCKR tool? Phenomenal! It's like having a personal assistant for SERP analysis.

Room for Improvement
However, it isn't without its areas for improvement. The developers need to invest more into creating workflow tutorials. This would significantly benefit users of all levels to fully utilize this tool from start to finish for different case studies.

Strell vs. Other AppSumo Tools
When comparing Strell with other tools available on AppSumo, like Neuron Writer, it falls short in terms of some features and user interface. But, with a few tweaks and a bit more attention to detail, Strell has enormous potential to surpass its competition.

One feature I would love to see implemented is topical discovery like how Writerzen does it. This, along with adding the Keyword Golden Ratio feature on the LCKR tool, would truly make Strell a formidable tool in any SEO arsenal.

Final Thoughts
Despite some minor shortcomings, my optimism remains strong. Strell has a lot to offer, particularly it's flavour of the LCKR toolsets. With a few upgrades and enhancements, I believe Strell could become an industry frontrunner in SEO optimization tools. Can't wait to see how they evolve!