Specifically to the second question...it depends on what you mean by "secure". When fully plugged in, the outlet is secure and doesn't rock back and forth much, so one could say it is secure. But if you are frequently plugging in, removing, plugging in, removing, etc, the outlet WILL come loose from the plug (at least that is what mine is doing). IMHO, I feel the center set screw is needed and a lack of one is a problem. I did purchase this as OPEN BOX return and maybe that is why it was returned? I'll be purchasing a brand new one and see if that makes a difference.