SheerSEO is one of the best tools I ever bought here and has become one of my favorite SEO tools that I actually use all the time.
The tool is robust, extensive, easy to use and fast responding. The data provided is of high quality which is super important for serious work. It's not some kind of new startup but a well developed tool that has been developed and improved for many years.
Initially I bought SheerSEO a while ago when they were on Appsumo an earlier time. Didn't spend too much time with it and wasn't overwhelmed at least. Even thought about refunding as it seemed slow and antiquated when I tried it. What a mistake! I came back to it a couple of months later and it had solved all the problems I had noticed. Then I started using it more and discover lots of potential I had missed before.
After using SheerSEO for quite a while now I really appreciate the attention they give to details. Focus definitely is on real world SEO work and they understand what's needed. Even though On-Page Audit is just one of many features, it's very extensive, detailed and well-structured into critical, warning and notice.
There are lots of helpful filters wherever they're needed, Rank tracking also supports other search engines such as Bing and Youtube, all kinds of SERP features and even local pack tracking.
Reports are great and can also be exported as PDF not only CSV which is great. They can be completely white-labeled. Automatic reports can be scheduled to be sent by mail every week or month. Lots of options to customize here.
Support is also great and super fast. No matter the day or time, the owner Ayal gets back to any question usually within minutes, quite incredible. Answers are clear and helpful, not some stupid first level support.