Any of you checked out the Site Improve platform?

Any of you checked out the Site Improve platform? I was pitched by the sales team, and only really interested by the extensive accessibility check component of it, which they gave me a demo of. But at over $3k/year for the leanest version of the app, no thanks. Very good UX though, and would make bringing a site up to Level AAA WCAG standards. gain, very impressive UX, but ya, I could throw that $3k at something else for greater returns, so I`m looking for recommendations on other slick WCAG accessibility platforms/checkers.