yeah, but when there are 10 cm of fresh snow on the road, you don't usually need tyre chains.
On the other hand, if it's like in the pi and it's a layer of compressed snow and ice, then that thing sure is handy, as you don't have to put them on and off all the time, which is not only time consuming, but also quite a PITA, or rather, in the fingers, due to the cold.