Tried out the app, but like all time tracking apps out there it fails to meet my extremely simple needs. Here is what a time tracking app should do to be fun to use (I would build one myself if I didn't sign a non-compete):

1) Don't require me to have clients, project, or tasks. Just allow freeform entry. If I don't want to assign time to a project, but just a client I should be able to.

2) Let me mark hours as billed! I don't want to have a project list that looks like, "Project 1a, Project 1b, Project 1c). It makes reporting messy.

3) Don't have New Project, New Client, etc. screens. Just create them when I enter it into the form.

4) Must have a good time tracker that I can start, close, and come back to later to submit.

Doesn't seem that hard to me. Freckle is the one that come closest, and their UI is subpar and they don't allow you to mark hours as billed.