I love the visual aspect of this timer and how you can clearly see at a glance how long you have remaining to finish a task. (That provides REAL motivation to keep working.) We use this timer for school lessons, housework, my work projects, and even some free time activities to keep us on track.
Before we started using the Time Timer, my children would still be completing lessons late into the afternoon and we were all frustrated. I discovered that the problem was that I was not ensuring they were staying on track. Sometimes they would continue working on a lesson because they were enjoying it or really wanted to master it before stopping instead of moving on to the next scheduled lesson. Once I started enforcing lesson time limits, our school days ended on time more frequently. (e.g. If scripture memory is scheduled for 10-minutes, they were to set a timer for 10-minutes. When the timer buzzed, they were to stop and move on to the next lesson.)