You should use it if you:
- are a seo newbie
- are not seo related - just a website owner
- work at seo agency
- want to monitor job of seo agency as a website owner

Here is what I like in SeoGuru:
+ veeery intuitive (it is almost impossible to do so friendly and intuitive layout/UX when you are in SEO bussiness but they achieve it!)
+ quick (first audit takes few minutes for 300 subpages website)
+ general and detailed suggestions and information about each page
+ thanks to integration with Search Console and Google Analytics AND regular automated re-check you can keep your eyes on important factors of any subpage of your website
+ notifications on the dashboard are very informational
+ SEO to-do list (what to do to improve rankings after audit)
+ insights sections with suggestions and warnings (like "keywords at risk" or "low-hanging fruit")

What it should have:
- integration with Bing
- some reports have only "last 30 days" timeframe it helpful if SiteGuru could compare different date ranges (not always possible, but it is my wish ;))
- KPI should be editable (or maybe I didnt found a place to edit it).
- no info about AMP - it does not analyzes AMP versions of pages.

Ive tried many different tools that can audit and monitor SEO/SERP related things (still use AccuRanker bought on appsumo) but SiteGuru is the best tool ever used.