I've been using this for some time, after noticing that my teenaged daughters were spending an inordinate amount of time online. It generally works as advertised, and has a clean, usable interface. Well designed and professional solution overall, especially considering the low cost.

However, I found a couple of things frustrating. Some of these are beyond the power of the developer to fix, but they do hinder its usefulness.

First, the warning messages do not work if the program operates in the background. My daughters quickly figured out that they could run iTunes as a background app and never worry about the time restrictions.

Second, one of my daughters quickly learned that once her times expired she could just log in as her sister, which led to a couple of battles until passwords were changed.

Third, be careful how you set up programs, because if you set up an individual app you can't convert it to a group later (same with simple vs. complex time charting).

Fourth, the time graphs appear to be completely bogus. After one of my daughters used her entire 8-hour allotment of web browser time, a check of her log file showed 20 minutes had been used. Very odd.

Fifth, the warning messages do not always display.

Sixth and most problematic, when the warning messages come up after your time has been exceeded (say if a program was in the background), you have no opportunity to save the data. I would like to see a preference option to automatically save before quitting any program.

But these are minor issues. Overall, I find this immensely useful. It has helped me stay out of my kids' hair, allowing the application to deal with their use of computer time.