Firstly these tires have a version with and without studs- I use them WITH studs as that is allowed here.
Secondly, I have used these tires on my previous car also for about 25 000 kilometers
Thirdly all my cars are Quattro so that may change some things.
I have heard quite a lot of negative feedback about these but all from small front-wheel-drive car users, don't know anyone with an RWD car so can not comment on that.
For me, these are really nicely controllable tires in snow and also on ice. I do not have any experience with premium category tires but to date, these are the best I have used.
I'm quite an aggressive driver in winter and I love the control over both of my cars going sideways with these tires. Also, I have never had any unpredictable or uncontrollable situation with these not going straight or in corners. Any coming slippage can be felt in and corrections can be made in advance.
The suds stay nicely in place (of course after running in tires correctly of course). In my other car after 25 000 kilometers, most of the studs are still in place, there are on a tire with 6 missing and that is the worst one. The thread also looks ok and I estimate that 30 - 40 thousand kilometers can be achieved if nothing suddenly changes in the performance later one.
I'm not really sure that this will help anyone but if you use an all-wheel-drive car and studs are allowed in your region I suggest to trie them out as the price are quite good in my opinion.