The most useful feature is that you can easily subscribe as your website changes, but it's also easy enough for someone with no technical knowledge at all (like my dad) or even kids who are just learning how computers work! I wish they did something about mobile compatibility - maybe an app would help? Currently using this mainly in connection w/ our WordPress site so there isn't much else we have found yet since its not really used elsewhere, except perhaps internally when working out SEO issues etc.. That being said though having access to these kinds of tools makes life easier :) We use WP Rocket which has made things like caching plugins extremely helpful; otherwise performance could be better without them.