I love this feature in concept, but I'd like it even more if its behavior were static instead of like X-mouse. I'd rather all inactive windows have trans until activated (e.g., on window or Taskbar button click) rather than simply on mouseover. As it is, the strobe-like effect quickly gets very annoying & I've chosen not to use it for that reason.

While I'm here, three other observations:

1) The setting for the timer only affects leaving a window, not mousing over a window. No matter what setting you choose, the trans window becomes immediately opaque as soon as you mouse over it (hence, in part, the problem mentioned above).

2) Although the description says "all" inactive windows will be made trans, that isn't the case in practice - maximized windows remain opaque when inactive.

3) The right, left & bottom borders remain opaque in inactive windows (a non-perpixel skin, BTW); the Titlebar and window get trans.

Fix up those little glitches and this feature alone would justify the cost of WFX. This is a great idea that could use a better implementation, if it's possible.