I would be happy to test it and provide feedback.
We are a little but highly professional company in The Netherlands; we use WHMCS as our billing solution for systemmanagement (timebased and packages), webdesign (packages and sometimes timebased) and hosting (+addons).
We are work with 3 fulltime and a lot of freelancers.
We track our time per projectnumber in a daylog (paper) and at the end of the week someone make billable items from it in WHMCS.
If you want further contact please add me to Skype: sidershop
or e-mail me: bjarne( add ) sider.nl