Glad to report that these work great for running HD-SDI signals. The previous BNC cable monoproce sold (which I grant never advertised HD-SDI capabilities) could not reliably pass 1.5G signals, especially at longer lengths. I have tested these "viper" cables up to 200 feet and they have not had a single glitch. The cable is thicker than most which could mean good insulation. It makes them a little tough to wrangle but actually they are more flexible than some stiffer thinner cable I have used on set. All in all a very good value. The only question remaining is durability of the cable and heads over time.
PROS: Reliable for 1.5G HD-SDI signals Thick, but relatively flexible Lifetime warranty sounds encouraging
CONS: Thick, so somewhat stiff and a little difficult to wrangle Heads are also pretty large and rigid, making these cables less than ideal for connecting in tight spaces
I have used these cables for two auditorium installs so far and have had no problems. On was a 150ft run and the other was 100ft run and both worked well. Used with MP HDMI to SDI and SDI to HDMI converters with the cables. Its nice to be able to get everything I need for an install at one place.