Ranked in these QuestionsQuestion Ranking
Pro Open source
With access to the source code, savvy users can make under-the-hood tweaks to suit their work style.
Pro Unlimited number of users for free within a single project
Multiple projects require the paid version, which is available for a reasonable price.
Con Aimed squarely at (semi)professionals
It simply doesn't work as a personal to-do app. Granted, it was never meant to be used as one.