Love my Uway NT50B with black flash. When I used white or IR flash cams, I'd get one or two pics of a nice buck and then not seem him again for months. With the black flash, I get the same big bucks week after week. I'm convinced they do not see the black flash at all, and that the regular IR flash and white flash makes them avoid the cameras.
Also on the white flash cams, they would usually only stick around over corn for about 3-5 mins, but they stay about 30-45 min with the black flash so I get lots more pics from different angles. I get about 3 months from 4 C batteries with the Uway in picture mode. I've never bothered with the video mode.