Here is a before and after I made using the filter when I had the trial version.
BEFORE:
I made a selection of the plane and the foreground, then inverted the selection, then used the Bokeh filter on the background with some very modest settings.
Once that was done, I applied a gradient layer mask to that layer to fade the effect from background to foreground.
AFTER:
The overall effect is minor, but I think it sets the plane off from the background just a little. Just my opinion, though.
I shot this with a Tamron 200-500 f/6.3. This lens is rather soft at f/6.3, and is sharpest at f/8 or f/11. This particular shot was done at f/11.
Would a better lens with a wider aperture have helped me? Sure, but I didn't have a better lens on that day, and I only found out that this plane made a quick stop to Addison at the last minute so I didn't have time to rent a better lens. I could wait for a re-shoot with different equipment or I could use the Bokeh filter to blur the background on the images I already have.