From simple broken links and misspellings to more complicated accessibility issues and SEO shortcomings, I've relied on SiteImprove at three different organizations. Every organization thought their site was in good shape, until the results of the first scan came back.
Now, I look forward to my weekly reports and, for a property which hovers around 10,000 pages with hundreds of updates per week from a small web team, there's never a lack of items to address each and every week that we would never know were issues otherwise.
SiteImprove is at the core of our quality assurance efforts. Our properties now have few, if any, broken links or misspellings and we're getting closer to full WCAG 2.0 compliance with each passing code deploy.