To me, the most valuable feature of Clarity CA is the timesheet. It's the only feature I use because I just support the tool, and I just enter time on it. Others use Clarity CA for other purposes, such as resource management, project management, scheduling, and financials.
The tool also has a fairly simple integration with other systems, so at the moment, it's working fine.
I also like that you can write your own code in Clarity CA, and you can make changes to it based on your needs.