I bought these tires about two years ago, and since then, I've been impressed with them. It doesn't snow much where I live, but since my house is up a hill, I thought I wouldn't want to get stranded when it does. I used these tires across a very wide range of temperatures, from -5°C to +40°C.
When the weather is hot, the tires get very soft and lose traction easily. Since my car has only 65 hp, I noticed that when the weather is above 30°C, it's a lot easier to make the tires spin in place.
As for wet conditions, when the rain has just started, the tires have no grip. It's easy to lock all four tires under braking, and wheelspin or even lose the back end of the car. However, once it has rained for a little while, the tires perform better, as long as you avoid puddles. I've hit a puddle while going around 60 mph and thought I was going to die. Fortunately, it didn't upset the car too much since both front tires entered the puddle at the same time. However, if one tire enters earlier, it creates a lot of drag on that tire and tries to spin the car. I don't think water evacuation is very effective.
As for snow, I can't say I didn't like these tires. As long as you're driving according to the conditions, keeping an eye on your speed and the distance between you and the car in front, they perform well. Yes, they wheelspin easily and lose traction, but that's expected in snow.
I haven't had the chance to try them on ice. Regarding wear, I'm really impressed—they look the same as the day I got them. I think this is more about the car, though, since my car only weighs around 800 kg.