I like that you can see very specific information about your site's performance, both in terms of traffic patterns as well content engagement level - this is quite unique to other services out there! You also have great customer support (which we love!).
There are some features missing from TMC which include more detailed reports by category/keyword or even time range per page view such analytics could be added too but overall it works really good enough :) It helps us understand our audienceβ¦