This is really very very good. I have been using it now for 2 months to keep track of the 3 jobs I currently have. For me the best feature is the ability to set the extra hourly wage I am paid for working certain hours during the week, at night and at weekends. Once these are set I simply need to "punch in" and "punch out". The app works out the rest for me. It is also very useful if you are going to charge a client for your services. The ability to enter hours work historically is also very useful.
One last thing: Great support!