We've had this timer for about five years and I am on Amazon now shopping for a new one. We've liked the styling and functionality of this timer's various features and modes, but it has one fatal flaw: the buttons often do not respond to your touch, requiring two or three pushes of the button for a response. Perhaps this design flaw has been fixed on newer models, but on our timer, every single button requires the user to be extra vigilant and diligent about making sure your button-push 'took.' It's especially hard to get the timer to respond when you have to push TWO buttons simultaneously, as when you are clearing the previous time in the 'stopwatch' mode.I don't mind having to fiddle with this timer when I have the time, but on some critical applications where seconds count (film development in days of yore), this is not the timer you want to be using.