As soon as you start using Crono - you will instantly see its simplicity shine through. Unlike most time tracking products on the market currently - visually it is very appealing to the eye. For me this is key when submitting a large volume of timesheet's to each project.
Crono is fairly new - which means it still has some way to in order to become the finished article. For me adding a filtering by project feature would be beneficial.
For me Crono does a good job in identifying where you are spending too much time. I think this is a fundamental to a time management software. Acting on this will ultimately results in an increase in productivity.