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Not having seen the effect that the filter produces it is hard to say, but perhaps I should amend what I said above. I don't mind the look of diffraction spikes in general, provided that they are there because of something in the optical train which actually causes diffraction to produce the spikes. Spikes added in post production by software usually look like spikes added in post production by software and I am not nearly so keen on that.
I have seen software that is pretty sophisticated about it, even adding the coloured "Stripes" in the spikes (Which I presume are slightly different diffraction effects depending on wavelength) that for a newt for instance indicate that it is pretty well collimated when you see them in an RGB image.
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