This really is a useful power chord extender - IEC male and female sockets - which I use to daisy chain a number of stairville (brought through thomman) led bar units.
Words can not express how faster it is to set up multiple lights with these cables - essential to reduce stage clutter and free up power sockets. Could also be used with a power distribution hub in a rack unit.
I wanted a 5 metre cable but got two 3 metre ones and simply plugged one into another, very flexible bit of kit to have in the stage box.
Only used for 2 months but can't comment on reliability - but it's just a cable, but one has been built strongly