I didn't like it because I hated getting interrupted after 25 minutes. It kept breaking my focus.
What I found worked well for me instead was "count up" pomodoro.
- Start a stop watch or simple wrist watch and leave it on your desk.
- If you glance at it and it is less than 25 minutes, keep going.
- Else if it is over 25 minutes, take a break if you feel like it. Write down how much time you worked. At the end of day, add up your time.
Although it is probably good to set a timer when taking a break because you do want to be interrupted in that case.