“I like it for its simple effectiveness, it's a short length of cable with a comfortable push-button in the middle, a C-socket on one end, (for the power supply lead) and a C-plug on the other end (for the Pi). You might not need it if your Pi is integrated with other equipment into a permanent setup but if you are experimenting on a table-top with the power supply under the table in a rat's nest of cables - you definitely need it. Simples !”