My personal experience was that the filter gave me some more black details (good), made me lose some brightness (bad) and somehow, I never got the colors exactly calibrated for it (pretty bad). Though, I'm sure others here have had a better experience with it.
What are you driving it with? Is your problem more that the blacks don't look black enough or that you can't make out enough detail? I was all ready to do an upgrade soon on my M20x until I switched from PowerDVD to TheaterTek. I noticed a huge difference in how much I could see in dark scenes like chapter 30 from LOTR. The filters are under $30, so I think it is worth it. As long as you are willing to give up some brightness. The combo I think I'm going to go with is a Hi-Power screen, a filter and settings to get the best colors. With something like 30 ft-lamberts I can make out a lot more details and with proper masking the blacks look pretty black. In fact, I think the extra brightness gives me more room to play around with the settings. With a dim image the details just disappear for me. I think Mr. Wiggles has posted before that he has never seen anybody who preferred a gray screen to the Hi-Power when he showed them both.
Also, the TheaterTek image quality advantage is mostly the new Raviscent Sonic filters. I think those can be had for about $15 from Microsoft and then combined with ZoomPlayer for those on a budget.
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