I don't drive that often, I usually take budget studded tires. I've been riding on Kama 514. The tread has worn out over the past six winters, not critically, it's still drivable, although there aren't as many studs left, but that's understandable after so many years. The pros are that they dig into the snow well, they perform decently on slippery roads, as a con - noise, there were a lot of studs from the start, so the noise is significant, although this is logical for studded tires. It becomes somewhat stiff at significant "minus" temperatures. But for me, this is good tires. I would like to take the same ones.