I drove from Vancouver, BC to Anaheim through Seattle and Portland for Christmas last year. We just happened to drive into the eye of a snow storm. I pulled into a Les Schwab store to get some chains and was met by a 2 hour lineup. All snow tires were sold out and the chains were selling just as fast. I bought a set of snow cables. The install was very simple but the cold and snow made it a pain in the neck. From my experience last year I learned that if I have to put on chains to drive on the highway, then it's WAY too snowy and icy.
Once you put the chains on your vehicle, the maximum speed you can do is about 20 miles per hour. The you can hear the chains resonate throughtout the car and if the're loose at all, they will bang agains the inner wheel wells.
All in all, the chains came in handy to get over the really bad sections of the higher passes throughout Washington and Oregon as well as Norther Cali., but I had to take them off and put them back on way too many times. It's not fun trying to put them on or take them off every fifteen minutes, in freezing temperatures. Also you can't drive with the chains/cables on bare asphalt.
Hope this helps you,
