Anyone know anything about this device or have any experience with it?  I ran across it while looking at the State of Washington traction device requirements.  It seems to be allowed in lieu of chains there.  It looks simpler to use.  Tire Rack carried it for a while, but has stopped.  It can be bought from Amazon.com.

http://www.autosock.com/default.aspx?did=9079028

mcneely