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I have just bought a second hand Lumicon UHC filter, similar the the DGM one, but of course it's band pass is a little different. I have been really impressed with how useful it is. Just last night I used it for several objects, including two planetary nebulas (NGC1360 & NGC2438, for which it didn't improve detail in the nebula, but greatly improved the contrast with the background to make them stand out), and the Flame nebula in Orion (which was difficult to see without it, but the dark area through the middle was quite obvious with it).
Bear in mind a couple of things though, the narrower the band pass the less light will get through, so whilst contrast with an OIII filter might be amazing, you need a good sized scope and a bright object to actually see anything with your eyes! Also the UHC filter or similar isn't likely to let you able to see an object that was invisible to you before, but it should increase the contrast against the sky background and can reduce glare from bright stars a bit.
So in all, I'm very pleased with it at the price, but at the full cost of $155 I'd have replaced my 9 mm GSO Plossl with a Vixen NLV first....
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