Simple and straightforward
- Ability to add 'cards' which track bugs, tasks, etc.
- User can change the look of the cards (colors). Can change priority, Who the card is assigned to, Card Type, and many other customizations.
- User is able to add attachments and links to a card.
- User is able to add comments and track card history.
Cons
- Search functionality needs some improvement.
- Would be nice: ability to send a notification to selected people when a card is created/opened.
- Unable to sort cards - change their order visually.