It's great because you can do longer cable runs or even installation tests (you detach the tester, send a signal from one side and it receives it on the other where lights light up) - so it's pretty unique in that regard.
However for short runs its tiny bit impractical, because not all lead lights light up at the same time - it always does a sweep, and build quality is rather poor. It's cheap plastic, and battery holders are cramped and clunky.
Gets the job done tho, and it's a unique tool, so all in all recommended.