We feel that time tracking is an important element in any substantial project management system. With time tracking you can see how much time each employee is spending on a particular task or an entire project. Marking time as billable will allow you to add the time to an invoice.
Reports can be run on times to see specific times for a variety of configurable options. This puts you in control of your reports and allows complete customization. Easily export times as CSV to be imported into other programs.
Bottom Line: Time tracking and reporting provides excellent insight into a project's flow.