I have just been fitting some customer bought M.K. sockets and light switches; white Logic style.
I do not like the captive screws as they are initially very difficult to turn and you never quite know when they are fully tightened. I also do not like the very shallow light switch terminals that allow wires to come out, especially if twisted together. I ended up using a battery screwdriver to tighten the screws as my hands were starting to hurt.
Others' views please?
Z.