Integrity Pro builds on Integrity Plus. It has the new v9 crawling engine, it checks links and generates a sitemap with all the searching, filtering and exporting functionality of the Plus version. It adds SEO details and a sitewide spellcheck. It isn't intended to replace Scrutiny, but to be pitched between Integrity Plus and Scrutiny, a more affordable step for Integrity Plus users. There will, of course, be an upgrade from Integrity Plus, but this early public beta is simply free until the stable version is released.