I tried it a bit but find it missing features to make it useful for me.
Some things:
* The rounding of the time is wrong, 5:58 is displayed as 5 minutes
* Add option to resize
* Add option to alter colors
* Add option for a different color when you don't have the effect in the list
* Add option to make the bar count down from right to left or left to right
* Flashing color when the effect is about to wear off would be nice, like in buffbars
* Make the display of remaining time configurable
* Alter the method of adding effects, maybe you can make it to choose either a pattern match or add the effect to a list. Because if the effect wears off you will see the pattern string instead of the effect name.
* Show the effect image even if you don't have the effect (store in plugin data)
* Add option to enter a effect time for effects that don't have a timer (captain banner)
Basically I would like it like I altered buffbars, but that's annyoing to maintain if it gets updated :P