I will first say that I apparently missed the original Jon (jchuchla) group buy on diychristmas.org, probably because I didn’t know I would be going rgb in 2016. The original thread discussing the item can be found here and it will explain that it is a tiny PCB used to splice or power tap/inject. They come in a panel of 50 for $5!
So what would I use it for and do I need it? That is a tough question honestly and for the price I do not really care, if I can come up with at least one possible use. Luckily, I do not think it is that difficult to realize that if I have a pixel go out, I have to perform some minor surgery where I cut it out and splice in a good one by using a bunch of solder and heat shrink. Why a bunch of heat shrink? Well, to make sure the wires do not touch and cause fuses to pop or fires to start… although I do like a good fire when it is cold.