"...Never use a driver bit in a mains drill."
Well, no, wrong lesson learned my friend. Keep your other hand away from the business end of your drill/driver! Use needle nose pliers if you absolutely must grip the screw.
Having said that, a Robertson bit in like new condition will hold the screw perfectly fine!
There are crappy bits, and then there are good quality well machined bits. Pay the little bit (heh...) extra; worth every penny, especially if it's magnetized. But keep your hands away from the whirly things!!!