Since 2008 I've been using AIO SEO then Yoast (free) and later Yoast Premium and switched to SEOPRESS and then over the last year MathRank.

BUT NOW - Squirrly has ended this long journey on the WP road to SEO goodness.

Simply, it's all been said by others.

LOADS of functionality !!!
Does NOT slow down site.
Great guidance on how to optimize serps, pages + site.
Includes options that are typically PREMIUM paid features or add-ons: including easy-to-add schemas, videos within sitemap, SEO audits, keyword research + ranking.
Good support + documentation.
Recent big updates were great.

WHAT I'D LIKE TO SEE:
1. Yeah, like others please overhaul the UI (drop/limit the cartoons).

2. Replace a few WP plug-ins that are currently necessary for a total SEO package:
a. More robust 301 / redirect monitoring (replace 301 Redirects Pro I use)
b. Replace: No Category Base (WPML) plug-in internally.
c. Load Google Fonts internally: replace - OMGF plug-in.
d. Replace: Async JavaScript plug-in.

(I realize some of the above may be a little beyond normal SEO, but ... my wish list and they all contribute to Pagespeed - thus, SEO in 2021).

This is a solid product and as a LTD - amazing value.

Grab it before it goes ...