If you read all the bumph, you'll see that you can drive on the AutoSocks on dry tarmac for short stretches between snow, just keep under 30mph. I'd hate to have to put mine back on after taking them off, because they come off soaked and filthy with road salt if you've used them to get as far as a gritted road.
I ran mine through the washing machine once I got to work, and they dried on my office radiator during the afternoon. But what do yo do if you don't have a washing machine at work and need them again on the way home?
They're great for getting you out of trouble or facing a severe, unexpected snowfall when you absolutely have to get somewhere. They're not a replacement for winter tyres though. They're really a replacement for snow chains.
I haven't needed them this year because the winter tyres on the front wheels have surpassed all my expectations. However, I still carry them just in case.
Rolfe.