We have seen a lot of drones on this site. Even Electronoobs made a few PCB drones. The idea of making a PCB-based quadrotor isn't unique, and 4pcb definitely isn't the smallest. But it strikes a good balance between size, cost, buildability, and flyability. It's a PCB quadrotors with integrated brushless motor drivers, so there's no need to wire up external ESCs. And it runs on XBee digital radios, so there's no RC receiver or servo-style wiring. You can see more on the instructabels where Scolton, the creator of taht post, will explain more, here on this link
. When he says he build the quad from scratch, he literally did it. Neither did he use any commercially available Radio Control, nor did he use any Electronic Speed Controllers (ESCs).
If you want to order your own PCBs, use PCBWay.com
and select your color.