I bought the box to try it despite some reviews. I had no problems with that. I find it as flexible as solid copper wire and my box is not fragile like some other reviewers have said. None of my runs exceeded 150 feet, but I have no packet loss at all. I can't say how this cable will perform on 300ft runs, but it has worked great in my home. (By the way, I'm using it for an IP camera system with POE cameras.)
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