Quick to fit once you know how, loads more grip than with chains.
I have both chains and socks provided by the company, in the deep snow earlier this year the snow socks were good but when I got stuck on the back roads over the Pennines the socks had to come off and the chains went on.
Admittedly it was so deep that the snow drift I drove into stopped my door from opening, so I had to climb out of the window and spent half and hour digging enough clearance to get the chains on. But once they were on it turned the front on my Sharan into a snowplough and it pulled itself out .