I Personally Haven't...
But I have had some friends try some of the new filter systems and caps with no to limited success.
I do occasionally get some interest in installing the cheapest screens the big boxes sell. These people often back away when I put together a rate for it. They have a hard time grasping that it takes me more time to clean a gutter and install a product, than to just clean.
They also seem to not realize that I don't have to move a ladder and reset as often when I'm just cleaning.
To be most frank, I don't get many gutter jobs anymore. I don't try for as many, and people are skeptical until the weather really changes. Then they call.