Its ceiling is too low. I have only found it useful for the most basic of tasks (like a personal priority list) or a single project's sprint tracking. It falls

Its ceiling is too low. I have only found it useful for the most basic of tasks (like a personal priority list) or a single project's sprint tracking. It falls apart terribly when you need to introduce any sort of collaboration and process. Compare that to something like JIRA. JIRA has a high floor, but can be very useful as long as people don't go crazy.