This is a great, full-featured app that does it's job well. My only concern is: Starting a count-down that isn't one of the presets, requires at least 5 taps + the setting of the actual countdown time: It's in the menu(1), under Settings(2), ...(3), done(4), done(5), start(6). It would be helpful to have a "Custom Countdown" button on the main screen for quickly defining a non-preset countdown time. Other than that, it does it's job well. I like the red "count-up" after the count-down is finished, allowing me to see just how much overtime has been used.

Great program. I've started using it for keeping track of time when shooting air pistol and given the following features below it would be a great shooting timer (let me know if you need more information should you care to implement them):
Keep backlight on at countdown (regardless of other settings).
Mark by sound (a bullet hit); see for example http://sourceforge.net/projects/shottimer/).
Warning at half time, 1/4 time, ten minutes left et c (to let the user know how much time is left).
Two timers at same time (in an air pistol competition men get 1 h 45 min and 60 shots, 75 seconds/shoot). Possibility to see a 75 sec timer at the same time as the overall timer. This time should be reset for each mark and start over automatically.
Stop timer at mark # n (that is, 60).
It would be truly great if you could add any of the features above. Let me know if you need any help.