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I've recently purchased the DGM Optics NPR filter (narrowband). I haven't done any conclusive tests yet, but we gave it a brief comparison (on only 2 objects, it was brief!) last time up at Kulnura against an Astronomik OIII and a Celestron one (Louie's).
They all performed slightly differently, some showed more stars, some showed more nebula, some showed better contrast.
I'll be doing a more comprehensive review next time up at Kulnura to give you a more definite answer, but it certainly performs well for AU$80, compared to AU$190 for the astronomik.
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