I like how easy it was for me to set up, we had one server with multiple domains so setting this right required some knowledge of HTTP routing but once thats done its been flawless in terms of our needs! The only downside at present would be if you have many users using your tool then there could potentially become laggy performance issues when they are all trying to load their own data - which thankfully hasn't happened yet as far as i can see? Great piece of software, used headrooms analytics function really well within my team (which helps us understand what content gets more engagement).