While there's a warning when time gets critical, this isn't as useful for increment play since you're often completely fine at low time for extended periods. Thus, it's easy to get carried away at the last few seconds (weighing options too long because you know there's an increment).
A much better system would be to have another warning at 5 seconds with perhaps a voice counting down based on the time or at least different sounds. I just lost two games in a row like this and it wasn't even due to true time trouble. It was because I thought I had the luxury to choose between several winning moves. Instead of having 2-3 seconds left like I expected, I just got timed out. There was plenty of time if I were more aware of the situation.
A much better system would be to have another warning at 5 seconds with perhaps a voice counting down based on the time or at least different sounds. I just lost two games in a row like this and it wasn't even due to true time trouble. It was because I thought I had the luxury to choose between several winning moves. Instead of having 2-3 seconds left like I expected, I just got timed out. There was plenty of time if I were more aware of the situation.