The error reporting is very helpful, as it provides feedback that helps me improve my code without having too much time wasted in debugging or tracking down issues myself! It's not quite perfect yet -- sometimes I need more information about an issue reported by ES before taking action - so perhaps this could be improved upon? But overall we're happy with how well they've implemented their product over our website (which has been running since 2011).
They are constantly improving things such us UI/UX improvements which makes life easier when working remotely from home all day long :).