I first bought a set of these when I had my Mazda3. I liked them enough to get them for my wife's focus. I sold the Mazda3 set to a colleague when I bought my Mustang, he drives 150 Kms a day and had no issues. He kept them on until May, about 2 weeks after winter ended this year. I put them on my Mustang and got through all the Polar Votexes without problems. The biggest challenge was the uphill drive thru at Timmies when it got icy.
My impression is that they are much better in winter conditions than all seasons but probably a step below the likes of Blizzaks. In the rain or dry conditions, I found them to be excellent. There was no need to pussyfoot around corners and ramps. My wife liked the ride better with her snows but did not want to be one of those people who keep them on year-round. Also, there was none that spooky squirmy feeling that you get with some snows.
I did notice that they are undersized. They look skinnier than my OEM BFGs on my Mustang. Also, my GPS showed 97 Km/h at 100 on the speedo whereas my BFGs are bang on. They are more like 215/60/17 than 225/60/17 that are supposed to be.
I bought used set of Bullitt rims that came with Goodyear Ultragrips which have a lot more tread than I was expecting. I am going to try them out and see how they compare. They are a different size at 235/55/17. I may report back a comparison. I am hoping they don't get tested as much as the Sailuns did last winter.