This plugin breaks.
Plugin could not be activated because it triggered a fatal error. Fatal error: Cannot redeclare countdown_style() (previously declared in wp-content/plugins/jquery-t-countdown-widget/countdown-timer.php:71) wp-content/plugins/t-countdown-control/t_minus_countdown.php on line 478
http://wordpress.org/extend/plugins/jquery-t-countdown-widget/
@Caps. Correct. You can not use both the t-minus countdown widget and the t-minus countdown control. You need to pick one to keep and one to delete.
Oh, let me try that. Looks like "Control" has more functions like Pro. You may want to return an error that T-Countdown has been detected, please remove that plugin then try again.
Caps
P.S. On your site I did not see where it says it replaces T-Countdown, I understood that it extended and managed T-Countdown.
@Caps: Yes, Control is a pro version that is in beta. Release candidate 1 will be out soon, with resolved countdown widget conflict issues.
As for the part about it replacing the Widget:
If the jQuery T(-) CountDown plugin is installed, please deactivate before installing T(-) Countdown Control.
http://www.twinpictures.de/t-countdown-control/
We will make it a bit more obvious, it's kind of hidden at the end of the change log.
Thanks for the feedback!