Man, whenever there is a woo topic there are always the same bunch of people barking "toy toy toy", almost like they get dividends from it.
Can someone from that crowd point me to better way to measure jump height in the same price-range, or maybe 2-3times more expensive and does not include multiple people. Sure, you can draw lines on blurry gopro videos.. but you are drinking way too much Kool-Aid if you believe that you get better precision by this "method".. As a few people pointed out, the jump on the video looks like 16-21meters, depending on so many factors.. So, to me the woo/piq seem like a pretty useful tools for this particular job...
If you need better precision, put a few on them on the same board and run the averages..
real photo from a friend here (he is not a shop or a dealer)