After watching a few of their webcasts I was finally motivated to learn how to use the masking mechanism for the Tiffen filters.
It takes a few minutes of futzing to get them right: sometimes the masks need to be generated, sometimes their just there, and for the path mask, the path has to be closed for it to appear.
Once you're past that (again a few minutes, not a much longer than that -- but they're certainly not immediately intuitive) you're in possession of a quick, easy to use masking system that makes a tremendous difference.
Here's an example
Pretty dramatic: the original is meh, the unmasked is unusable and the masked is interesting.