Struja
“Frost”
Going to call BS on this one. Totally disagree.
For a starter, that posting referred to https://www.tirerack.com/tires/tests/testDisplay.jsp?ttid=181 , which compared different performance winter tires. There is a huge difference between "performance" winter tires and actual winter tires. It did not compare the Sotozeros against Hakkapeliitta or XIce3, which would blow them out of the water.
Secondly, dismissing people's experience as "anecdotal" is insulting. In my case, not only did I switch from running Sotozeros to XIce3 on the same car - with a massive improvement in performance - I also swapped back-and-forth in short order due to getting a loaner car from Tesla with the Sotozeros. The difference was NOT subtle!
On a RWD Model S in very slippery conditions, the Sotozeros could not even climb a slight incline from a standstill. The car would not move an inch, it just sat there! I had to resort to TC off to get it to move at all. This is something that happened with painful repetition with the Sotozeros - multiple times each winter. In comparison, once I switched to XIce3 they never got me stuck like that even on a steep hill. Not once.
Your description of the Sotozeros performance makes me wonder if you've ever driven in real winter conditions. You say that you can't get the car to slide at all. In typical snowstorm conditions here there isn't a car on the road that isn't sliding quite a lot, no matter how good the car or the tires. Your location appears to be "California", which makes me think you don't experience anywhere near the conditions we do here in Ottawa, Canada. We're in the snow belt, and we get real winter.
I agree. Anecdotal evidence may not be full proof but it is certainly valuable. Like @Doug_G said, my anecdotal experience with the X-Ice 3's has been great. Both from a performance perspective but moreso from a noise perspective.