I don't understand why he needed the expensive PoE switches although. He could of used cat 6, consumer non-PoE switches & standard $15 PoE injectors close to the switches themselves. He wouldn't get the fancy interface for the switches, but he would of had similar wireless and wifi performance.
Or does Ubiquity require you to use their switches for anything to work properly?
I have a Unifi AC Lite and I just use the power injector that came with it. I think for the non-pros they use a non-standard POE, but I'm pretty sure the Pro's can use either Ubiquiti or standard PoE equipment
Their UniFi stuff runs on 24v PoE, rather than the standard 48v, so it requires either one of their switches or a compatible injector. Their cameras, oddly, do support standard PoE, however.
Or does Ubiquity require you to use their switches for anything to work properly?