I like that they are able to pull data from our site for analytics, which is very helpful in understanding what's working well or not so much with current SEO efforts being made by my team at this time! The fact we have been using them since 2013 has meant there isn't as many new features available now than when first signed up (which was great back then).
We're hoping their integration into Google Analytics will be more robust soon though - it currently works sporadically within some reports but overall pretty good once you get used to how its set-up initially. They've got an awesome support staff who really do care about making sure things work properly/efficiently; even if something doesn’t quite fit perfectly right away sometimes getting feedback helps us understand exactly where improvements need happen next before going live again later down the line etc..