We didn't have much /S last winter, so I can't objectively weigh in on the tire's effectiveness. Unfortunately, I won't be able to test them this winter either, since the tread was gone at 25k and need replacing. When I contacted warranty person, was told I needed to return the tires with proof of each rotation at my expense and a decision would be made on what, if any, credit I'd get towards a purchase of new Continentals. That's not going to happen. I would caution buyers not to let the warranty enter the purchase decision calculation
as its pretty much a waste of fine print.
The price isn't so great either, especially considering that I'll need to buy another set, pay another shipping fee, another balance and mounting etc. When adjusted for above, pretty much works out to $1000.00 per tire.
It's too bad, because if the tires were defective and Conti recognized as much, they should just replace them.