I have had two TSC boxes now and have had no issues with them. The first one was the "fancier" latch design that pooleo8 was talking about with the latch facing down. The one I have now is the more "conventional" style with adjustable latches. No issue with either, just had to initially adjust the latches on the second one and haven't done anything since with it.

Both of the boxes however, have had snow get inside of it when driving in snow storms. The wind must've circulated and forced the snow under the little lip. I never really bothered to fix it becasuse I was alway to lazy.

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1996 Ford Ranger STX 4x4 4.0L
1983 Honda Shadow VT750C