Not great

Has potential to be great app. Often wont connect, limited functionality from iPhone & server application buggy. Support has consistently been poor. Focus is on adding functionality & advertising, not fine tuning current issues.
Latest version still has sync issues, once you enter your data and the sync fails, your only option is to wipe all data (lose all your un-synced entries) and try re-connect to server. I keep waiting for old issues that need to be fixed, to be fixed. Hasnt happened in more than a year.

LAWmacbook about Billings Pro - Time & Invoice, v1.5.2