Being in the alarm industry for 30 years we used to use Robertson square drive screws for everything. The main reason was for security, back then no one new about them "in Seattle anyway". Once you start using them you're sold. I still use them for almost everything if I can get the correct size and type. Like mentioned the great thing about them is they stay on the end of the driver so you can use one hand, such as working over your head. Now I like Hex drives as well, they also hold the screw fairly well.