As a dps I <3 lightwell... I can click it as soon as I take damage from something and even when I am in the middle of casting/channeling a spell. The range on it is huge too (40yds I think). There really isn't a good reason to not use it.
---------- Post added 2011-09-13 at 10:25 AM ----------
Are the clickers or keybinder? A keybinder can easily keep up their rotation and click a lightwell... while it is harder to accomplish that as a clicker. Just a thought