I have an old, old, blog that I've updated since 2011 and taught myself WordPress website design and ecommerce on. It's been neglected since I stopped freelancing and got burned out a few years ago, and wasn't exactly wonderfully organized to begin with.
WP 301 redirects was just what I needed when refreshing and starting my own SEO audit. I'm removing similar categories and keywords, and shortening urls and titles. This plugin saves me the time of the extra step to add a redirect manually. The rules are really nice and work!
It is also nice to monitor 404 not found instances.
An conflict with w3 Total Cache was fixed within days of me reaching out to tell them of the issue.
This plugin is a "must" if you have ever changed domains or made major structural changes to improve your SEO!